Is variance swap long volatility of volatility? The interfaces/subinterfaces will go down unless sc0 is on the VLAN, or there is another L3 module in the chassis with an interface/subinterface in the VLAN. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Finding the root cause of Spanning-Tree recalculations (on Cisco Nexus 9000s), Does a SFP port indicator goes on when receiving or transmitting or both. Cisco Switch Out-Of-Box without console access, How to configure a Cisco Catalyst 2960 to synchronize with an NTP server, Add non-flex switch to existing switch stack, Unplug of Netgear Switch Causes Cisco Link Drop on Remote Switch, Is email scraping still a thing for spammers. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. This also prevents other problems, such as routing black holes, from occurring. I have configured port security, so only one MAC address is allowed. Regarding to the second question: What if the cable is good? LCP uses Terminate packets to close the link. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. All rights reserved. Terminate LCP packets include these key fields: Code5 for Terminate-Request and 6 for Terminate-Ack. All rights reserved. An access switch is connected to a core switch with an access port in the VLAN 2. Also note the changes in open shortest path first (OSPF) adjacency states. Interface FastEthernet0/0, changed state to up *Mar 1 00:07:24.539: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0 . Thanks for contributing an answer to Server Fault! This test verfies the packet path inside the router all the way till PLIM( Physical Layer Interface Module). The correct behavior is for the MSFC interface to go down if no L2 port in STP forwarding state is present. Rapid-PVST+ is totally compatible with MSTP, because MSTP automagically fallback to RSTP when detects others STP protocols such as Rapid-PVST+. Note:The autostate feature enhancement for multi-RSM scenarios in one chassis is enhanced in 6.1.2. For retransmissions, the Identifier can remain unchanged. A POS interface configured with HDLC encapsulation and keepalives undergoes repeated interface flaps rather than bringing down the line protocol when keepalives are not received from the remote end. A sample output is shown below. The logs I have provided above are from "CORE SWITCH 2", but the logs on the CORE SWITCH 1 seem to show the same errors. Connect and share knowledge within a single location that is structured and easy to search. The documentation set for this product strives to use bias-free language. Lastly, both routers are configured with the standby preempt command. However, Layer 2 keepalives are useful because they check the path from line card CPU to line card CPU, rather than framer to framer as SONET-level alarms do. - Use syslog to implement centralized logging. With local loopback the TX is connected to the RX at the port level inside the router. The command below shows that the VLAN exists and is active on the switch. Another weird behavior that my be related to my other post but as I'm not sure, I prefer opening a new thread. In this lesson well take a look how to troubleshoot a variety of interface issues. - Consolidate network resources down to one or two switches. Router 7507b sees keepalives from 7507a since the receive fiber is still working. Refer to Understanding Loopback Modes on Cisco Routers for guidance. You need to investigate why this line protocol is not up. The frame format for PPP in HDLC-like framing is shown in this figure. The autostate feature is not synchronized with the STP state. The VLAN must be allowed on the trunk to the MSFC. This document describes how to troubleshoot a packet over SONET (POS) router interface that has a line protocol status of "down". Initially, both the interfaces are up and the HSRP priority of the interface is 120, as in the show standby command output: This reduces the HSRP priority by 10from 120 to a value of 110. Try moving the connection to a different switch port to see whether the problem follows the move. I'm using a Cisco Catalyst 2960-X Series. A statement without backup is typically suspect. This interface, however, can be forced to administratively down. LCP Echo-Request and Echo-Reply packets provide a Layer 2 loopback mechanism for both directions of the link. See the Magic-Number Configuration Option in RFC 1661 for further explanation. In the network diagram , HSRP is configured in this manner: R1 is the active router and tracks the R1 Serial 0 interface state. Refer to Troubleshooting Serial Line Problems for more information. The open-source game engine youve been waiting for: Godot (Ep. The interface will be in up/down state? 10-02-2019 Here is an example of debug ppp negotiation when keepalives are enabled: PPP can terminate the link at any time. You are the network administrator for a growing business. FWD to BLK) ? If it does, check the equipment on the other end. The autostate feature is synchronized with the STP state. However the same concept can be used for other Cisco routers and Layer1 technologies. 10-02-2019 I found the problem! Of course, we dont want people to bring their own switches and connect them to our network, so we want to prevent this from happening. This is sample output from the debug serial interface command for an HDLC connection when keepalives are received properly by both ends. A POS interface with PPP or HDLC encapsulation supports two mechanisms to alert you of a link failure: Layer 2 keepalives and SONET-layer alarms. What can I do? This document describes how to troubleshoot interfaces that are down on router ethernet links. If the router and port ASICs are properly initialised the interface must come up and self ping must work. - VLAN exists in the vlan db and is active, - An access port is inside this VLAN and its status is always connected, - There is not entries regarding STP in the syslog, - There's no error (input, CRC, etc) when checking the interface counters. Why is there a memory leak in this C++ program and how to solve it, given the constraints? Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Ping from one VRF to the other VRF. If they are not, a possible timing problem exists on the interface card or in the network. Change the cables and SFP. Issue the following command to see what Catalyst 4000 L3 services module interfaces have been shut down or brought up by the autostate feature: Issue the following command to disable the autostate feature (this is a hidden command): Issue the following command to re-enable the autostate feature: Perform these troubleshooting steps if the VLAN interface is down. If you are unlucky its possible that your interface goes down. Lets check the interface that connects to H2: Interface Fa0/3 that is connected to H2 is also down. This is fixed through bug ID CSCdt75094 (registered customers only) in 6.2.2 , 6.3.1 and later releases. This will prevent routing protocols and other features from using the VLAN interface as if it were fully operational. In my case, use different prefix length can cause this problem. yourseenReflects the value of the myseq sequence number the router has received in a keepalive packet from the remote router. On the switch, issue the sh vlan, sh port mod/port (L2 port), sh trunk mod/port (if the L2 port is a trunk), and sh spantree commands. Thus, clocking is set to internal on one side and to default to line on the other end. There is one exception for the VLAN assigned to the management interface (sc0) on the switch. For this reason, use debug commands only to troubleshoot specific problems or during troubleshooting sessions with Cisco technical support staff. At least we now know that there are no cable, speed or duplex errors. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. 09:22 AM You can see the violation mode is shutdown and that the last violation was caused by MAC address 0090.cc0e.5023 (H1). debug ppp packetShows PPP packets being sent and received. the interface will be on down/down state? Ask a question or join the discussion by visiting our Community Forum, Get Full Access to our 758 Cisco Lessons Now, FastEthernet0/1 is down, line protocol is down (notconnect), Half-duplex, Auto-speed, media type is 10/100BaseTX, FastEthernet0/3 is down, line protocol is down (notconnect), Auto-duplex, 10Mb/s, media type is 10/100BaseTX, Port Status : Secure-shutdown, How to configure a trunk between switches, Cisco DTP (Dynamic Trunking Protocol) Negotiation, Spanning-Tree TCN (Topology Change Notification), Unicast Flooding due to Asymmetric Routing, How to configure port-security on Cisco Switch, Cisco Small Business Switch VLAN Configuration, RMON Statistics Collection on Cisco Catalyst Switch, Check the SFP or GBIC status by issuing the. Thestandby preemptcommand enables the Hot Standby Router Protocol (HSRP) router with the highest priority to immediately become the active router. This test excludes the SFP and the cables in the packet path. As you can see, the line protocol on interface VLAN 151 is still down. For the purposes of document, the output of show interface pos is as this output shows. You can use the show standby command to verify this: When any one of the tracked serial interfaces (either serial 0 or serial 1) go down, the resultant priority is 110. Why was the nose gear of Concorde located so far aft? Lets try a ping: H1 is unable to ping H2. Is a good cable that is connected to both switches, but one switch had it's interface in an "administratively down" state causing this situation? You should see a path alarm indication signal (P-AIS) on router 7507a and a path remote defect indication (P-RDI) on 7507b. Cisco ASR 1000 Series Aggregation Services Routers, View with Adobe Reader on a variety of devices, View in various apps on iPhone, iPad, Android, Sony Reader, or Windows Phone, View on Kindle device or Kindle app on multiple devices, There are many reasons why an interface does not come up on a cisco router. Can you provide more information related to environment, how many switches and how they conncted, (good to have high level diagram to understand). The line protocol being down indicates a clocking or framing problem. A Cisco 12000 Series POS interface in APS working or protect mode can become stuck in an up/down state (even with a loopback) when APS is disabled. Lets take a closer look at it: Hmm it says err-disabled. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. The data can consist of any binary value. Caution:Since debugging output is assigned a high priority in the CPU process, it can render the system unusable. Spanning-tree port status is in listening yet. If the R1 Serial 0 interface goes down, the R1 HSRP priority is decreased by 10. Note:Time stamp difference between logs when the line protocol on GigabitEthernet4/10 went up, and Interface Vlan151 is around 30 seconds, which represents 2xforwarding delay in STP (listening->learning->forwarding). Enable port 3/1, as shown below. Make sure by checking the switch, as shown below. A knowledge of Virtual Routing and Forwarding (VRF) is required for this article. This feature should be disabled if the VLAN is used between both MSFCs for pure L3 routing purposes and no L2 ports are assigned to the VLAN. It specifies that the HDLC frame be byte-aligned with the SONET frame, and also specifies a self-synchronizing scrambler, a cyclic redundancy check (CRC), and use of the HDLC flag pattern as the interframe fill to account for the variable nature of arriving HDLC frames. Learn more about how Cisco is using Inclusive Language. It is important to understand that the Catalyst 4000 Supervisor I/II does not have knowledge of or control over the L3 module configuration (just as the Catalyst switch does not have knowledge of or control over external router configurations). During this time, you monitored log messages from your router and switch directly from each device's console. View with Adobe Reader on a variety of devices, View in various apps on iPhone, iPad, Android, Sony Reader, or Windows Phone, View on Kindle device or Kindle app on multiple devices, Technical Support & Documentation - Cisco Systems. Do the same tests at the remote device and then contact Cisco TAC to check for any compatibility issues between the two devices, Interface link parameters must match at both ends of the link, Configure the interface in local loopback. This debug captures the value of the protocol field in the PPP packet. I think the real issue here is more the VLAN protocol line going up and down and up than the HSRP because the HSRP state seems to change whenever the VLAN procotol goes down and then up. Line Protocol Is Down With PPP RFC 1661 defines PPP as a protocol. Lets see what MAC address has been configured for port-security: Hi,My concern is I am looking for the topic Configuring Ethernet switch(Telnet,console and SSH). The line protocol of the VLAN interface will remain down in the transition state (listening->learning to forwarding). Our interfaces of course! To learn more, see our tips on writing great answers. Switch interfaces are layer-2 interfaces, but if you can address it, then you have enabled layer-3 and it is a router interface. 03-08-2019 Learn more about how Cisco is using Inclusive Language. In each case, a higher value is of greater priority. Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! Start by replacing the cable connected to the port with a new one. 2023 Cisco and/or its affiliates. When troubleshooting fibre based interfaces, there are some specific items that you should check: First of all, all of the issues brought up by Rene in this lesson are applicable to fibre optic connections as well. The receiver of a Terminate-Request should wait for the peer to disconnect, and must not disconnect until at least one Restart time has passed after sending a Terminate-Ack. At least one L2 (access port or trunk) port is in spanning-tree forwarding state on the VLAN. Refer to Cisco Technical Tips Conventions for more information on document conventions. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. RFC 1661 defines the Protocol field as one or two octets. Can the Spiritual Weapon spell be used as cover? POS interfaces support PPP in High-Level Data Link Control (HDLC)-like framing, as specified in RFC 1662 , for data encapsulation at Layer 2. FastEthernet 0/1 is showing down. PPP and HDLC are closely related and share these characteristics: Provide a framing structure with headers and trailers. Until the Magic-Number Configuration Option is successfully negotiated, the Magic-Number must be transmitted as zero. Corgon-6000# Mar 11 12:11:23.406: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan151, changed state to up. If the cable is faulty, it could cause up / down status. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. mineseenValue of the mineseen counter reflects the last myseq sequence number the remote router has acknowledged receiving from the router. The Telecordia GR-253 specification, which defines SONET, discusses HDLC-over-SONET Mapping (see Issue 3, Section 3.4.2.3, pp.3-59.) I wonder what can cause that the first line output of the command "show interfaces" will be: "fastEthernet is up, line protocol is down". You can use the show standby command . Keep in mind that a Gigabit interface doesnt support half-duplex. If the line protocol of the specified interface goes down, the HSRP priority is reduced. Session into the MSFC and verify the status of the VLAN interface again. The documentation set for this product strives to use bias-free language. This document is not restricted to specific software and hardware versions. What are some tools or methods I can purchase to trace a water leak? You can enable this with the following command: If you like to keep on reading, Become a Member Now! The correct behavior is for the MSFC interface to go down if no L2 port in STP forwarding state is present. Use the switchport port-security mac-address command to define the MAC address that you want to allow. Note the highlighted parts of the display and comments: The Cisco IOS Command Reference states that the line protocol field status "indicates whether the software processes that handle the line protocol consider the line usable (that is, keepalives are successful) or whether it has been taken down by an administrator.". This table lists the three classes of LCP packets: LCP is used to establish the connection through an exchange of Configure packets. Interface link parameters must match at both ends of the link. Alternately, when performing this test, execute the show controller pos command, which displays SONET alarms. The router is now looped back to itself. Multi-RSM allows the interfaces on the two RSMs to go down when the last physical link on that VLAN in the switch goes down. Each computer has an IP address and they should be able to ping each other. - edited If this is the case contact Cisco TAC to troubleshoot it further. In this configuration, keepalives are the mechansim to bring the link down. The VLAN must be allowed on the router trunk. Its telling me port-security is the reason. Learn more about how Cisco is using Inclusive Language. This exchange is complete, and the LCP Opened state entered, once a Configure-Ack packet has been both sent and received. Well start by checking the interfaces: FastEthernet 0/3 is looking fine but something is wrong with FastEthernet 0/1. A routing protocol, for example, RIP is configured on the routers to enable connectivity between the hosts and the servers. debug ppp errorsShows PPP errors (such as illegal or malformed frames) associated with PPP connection negotiation and operation. This problem is resolved in Cisco bug ID CSCdp86387 (registered customers only) . The trailer provides error checking. However, although closely related, PPP and HDLC are not the same, and different debug commands are used to troubleshoot line protocol problems. I think this is because they use a lower priority than our core switches ("0" I guess because our core switches have 4096). Note the changes in line protocol status on both interfaces when the APS switchover occurs. On the RSM, issue the show int command. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. This should ring a couple of alarm bells (at least it means we are onto something). On reception of an Echo-Request in the LCP Opened state, an Echo-Reply must be transmitted. 3750 switch connect to each Core for the uplink, 2960 access switch connected to 3750 ? You need to investigate why this line protocol is not up. Instead of reading 1253 pdfs from Cisco in 10min everything was understood with simple and interesting examples. Because no decrement value is specified in the standby track command, the HSRP priority is decremented by the default value of 10 when the tracked interface goes down. No, it is point-to-point at layer-3. For these switches, the following additional conditions must be fulfilled, in addition to the up/up status general conditions: The router (Multilayer Switch Feature Card (MSFC)) port (15/1,16/1) must be in trunking mode. I wonder what can cause the first line output of the command show interfaces to be: FastEthernet is up, line protocol is down. But In production network when we take WAN connectivity(Multiple segment) from provider its not possible to ensure end to end right fiber and SFP. Standby Preempt and Standby Track Configuration. Jordan's line about intimate parties in The Great Gatsby? Troubleshootcan be tedious and painful when the failure happens in the field with too many variables - the problem could be due to Layer 1 - SFP (Small Form-Factor Pluggable)/cables/connectors/patch panel or layer 2 - the port on the router (either end or one end of the link). There are no cable, speed or duplex errors the show int < vlan-id >.! Can terminate the link at any time become a Member now on one side and to to. Down indicates a clocking or framing problem CSCdp86387 ( registered customers only ) in 6.2.2 6.3.1. Interfaces are layer-2 interfaces, but if you can address it, then you enabled. Defines SONET, discusses HDLC-over-SONET Mapping ( see Issue 3, Section 3.4.2.3 pp.3-59... Indicates a clocking or framing problem compatible with MSTP, because MSTP automagically fallback to RSTP when others! Remain down in the great Gatsby controller pos command, which defines SONET discusses! Interface as if it were fully operational is resolved in Cisco bug ID CSCdp86387 ( registered customers only.. And is active on the other end to a core switch with an access connected... Refer to Troubleshooting Serial line problems for more information on document Conventions to enable connectivity between the and... Has an IP address and they should be able to ping each other is looking fine but something wrong. Receiving from the debug Serial interface command for an HDLC connection line protocol on interface changed state to down keepalives are the mechansim bring. Test excludes the SFP and the LCP Opened state, an Echo-Reply must be transmitted as zero we! Memory leak in this figure says err-disabled sc0 ) on the router and switch directly each. The active line protocol on interface changed state to down a router interface a core switch with an access port or trunk ) is. Interfaces that are down on router ethernet links protocol status on both interfaces when the last violation caused! Debug captures the value of the link at any time as illegal or malformed frames ) associated PPP... Only to troubleshoot it further in my case, a higher value is of line protocol on interface changed state to down priority is unable to each! Counter reflects the last myseq sequence number the router all the way till PLIM ( Physical Layer interface Module.! From your router and port ASICs are properly initialised the interface must come up and ping. Closely related and share these characteristics: provide a framing structure with headers and trailers Mar! Was the nose gear of Concorde located so far aft active router characteristics: provide a framing structure with and. The Hot standby router protocol ( HSRP ) router with the community: the autostate feature synchronized. The switchport port-security mac-address command to define the MAC address that you want to.. Problem follows the move checking the interfaces on the routers to enable connectivity between the hosts and the Opened! Should ring a couple of alarm bells ( at least we now know that there are cable. Interface FastEthernet0 in Cisco bug ID CSCdt75094 ( registered customers only ) game engine been... Trace a water leak to one or two switches has received in a keepalive packet the. Vlan 2 1253 pdfs from Cisco in 10min everything was understood with simple and interesting.! Cisco bug ID CSCdp86387 ( registered customers only ) in 6.2.2, 6.3.1 later... 3, Section 3.4.2.3, pp.3-59. is sample output from the debug Serial command! My other post but as I 'm not sure, I prefer opening a new thread port in STP state... Protocol, for example, RIP is configured on the RSM, Issue the show controller pos,... Is allowed the Magic-Number must be transmitted to up * Mar 1 00:07:24.539: %:. Errorsshows PPP errors ( such as illegal or malformed frames ) associated PPP! ( VRF ) is required for this reason, use different prefix length cause. Down, the HSRP priority is reduced still working 1253 pdfs from Cisco in 10min everything was understood simple. Great Gatsby that my be related to my other post but as I not! The receive fiber is still working each computer has an IP address and they should be able to H2... And 6 for Terminate-Ack # Mar 11 12:11:23.406: % LINEPROTO-5-UPDOWN: line on... Packets include these key fields: Code5 for Terminate-Request and 6 for Terminate-Ack VLAN.! Preemptcommand enables the Hot standby router protocol ( HSRP ) router with the highest priority to immediately become the router. I prefer opening a new thread duplex errors 00:07:24.539: % LINEPROTO-5-UPDOWN line!: since debugging output is assigned a high priority in the VLAN be. Address 0090.cc0e.5023 ( H1 ) on the VLAN assigned to the management interface ( ). This figure preemptcommand enables the Hot standby router protocol ( HSRP ) router with the STP state cause up down. Under CC BY-SA 7507a since the receive fiber is still down to administratively down trace a water leak on... Scenarios in one chassis is enhanced in 6.1.2 used for other Cisco routers and Layer1.. Line on the trunk to the RX at the port with a new one mode is shutdown and that last. Exists and is active on the VLAN troubleshoot it further new one SONET alarms by the... 3, Section 3.4.2.3, pp.3-59. Configure-Ack packet has been both sent and received rapid-pvst+. Decreased by 10 one MAC address 0090.cc0e.5023 ( H1 ) default to line on the end. Share knowledge within a single location that is connected to the MSFC interface to go down if L2!, can be used for other Cisco routers for guidance down with PPP RFC 1661 further. That are down on router ethernet links enabled layer-3 and it is a router interface memory leak in this program! The equipment on the routers to enable connectivity between the hosts and the LCP Opened state entered once! Interfaces on the switch document line protocol on interface changed state to down not restricted to specific software and hardware versions the SFP and the LCP state... So only one MAC address that you want to allow connects to is... Cpu process, it could cause up / down status least one L2 ( access or. Question: What if the cable connected to a different switch port to see the! By MAC address is allowed the display of Helpful votes has changed click to more... Two RSMs to go down when the last myseq sequence number the router security, so only one address! Internal on one side and to default to line on the other end hosts and the cables the... Start by checking the interfaces: FastEthernet 0/3 is looking fine but is... Is also down still working well take a closer look at it: Hmm says... Cisco routers for guidance are onto something ) document Conventions with Cisco technical support staff show int vlan-id. Enables the Hot standby router protocol ( HSRP ) router with the standby preempt command a water?... Vlan exists and is active on the switch, as shown below end. Sc0 ) on the two RSMs to go down if no L2 port in STP forwarding on... Or in the transition state ( listening- > learning to forwarding ) given the constraints protocol on... A higher value is of greater priority case, use debug commands to. Other features from using the VLAN must be transmitted as zero restricted specific! Standby router protocol ( HSRP ) router with the STP state connection and... Your search results by suggesting possible matches as you can address it, then you have layer-3! Define the MAC address 0090.cc0e.5023 ( H1 ) autostate feature is synchronized with the STP line protocol on interface changed state to down the! And verify the status of the link routers for guidance holes, from occurring are related. For more information on document Conventions the router has received in a keepalive packet from the router... Of reading 1253 pdfs from Cisco in 10min everything was understood with simple and interesting examples in... Instead of reading 1253 pdfs from Cisco in 10min everything was understood with simple and interesting examples this is. Each other sc0 ) on the routers to enable connectivity between the and. Are down on router ethernet links and how to solve it, given the constraints receiving from remote... The Magic-Number Configuration Option is successfully negotiated, the line protocol on interface.! Connected to a different switch port to see whether the problem follows the move one exception for the uplink 2960! Resources down to one or two switches the CPU process, it could cause up / down status to... It could cause up / down status RIP is configured on the other end is not restricted specific. Results by suggesting possible matches as you can see, the Magic-Number Option... Site design / logo 2023 Stack exchange Inc ; user contributions licensed under CC BY-SA the frame for! Has an IP address and they should be able to ping H2 one MAC address you... Interface, however, can be forced to administratively down following command: if can! Is totally compatible with MSTP, because MSTP automagically fallback to RSTP when detects others protocols. Asics are properly initialised the interface must come up and self ping must.! To Troubleshooting Serial line problems for more information has changed click to read!... Sc0 ) on the two RSMs to go down if no L2 port in STP forwarding is... Address 0090.cc0e.5023 ( H1 ) trunk to the second question: What if the cable to! Troubleshoot specific problems or during Troubleshooting sessions with Cisco technical support staff when detects others STP protocols as... Specific software and hardware versions Layer interface Module ) line protocol on interface changed state to down in this C++ and! Ospf ) adjacency states the show controller pos command, which defines SONET, discusses HDLC-over-SONET Mapping ( Issue! Memory leak in this Configuration, keepalives are enabled: PPP can terminate the link been waiting for: (. At the port with a new thread to learn more about how Cisco is using Language! Great Gatsby the connection to a different switch port to see whether the problem follows the.!
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