In addition, disable keepalives to avoid unnecessary line protocol flaps. Once each of the chosen network-layer protocols has been configured, datagrams from each network-layer protocol can be sent over the link. Its telling me port-security is the reason. As you can see, it is now down. The data may consist of any binary value. When bringing up a point to point link, PPP goes through several distinct phases that can be drawn in a state diagram. FWD to BLK) ? Speed mismatch (I personally haven't seen a duplex mismatch bring an intf up / down). See the Magic-Number Configuration Option in RFC 1661 for further explanation. Use a spare port on the same router and connect the port to be tested to it with the same cable and connectors/SFP. On some CatOS platforms, this feature can be disabled in order to allow redundancy in special scenarios. HDLC uses keepalives and reports the values of three counters in the debug output: myseqIncreases by one each time the router sends a keepalive packet to the remote router. Older switches don't have a tdr function you'd have to test the cabling manually. *Jan 2 00:00:04.247: %IOS_LICENSE_IMAGE_APPLICATION-6-LICENSE_LEVEL: Module name = c2900 Next reboot level = ipbasek9 and License = ipbasek9*Jan 2 00:00:04.451: %IOS_LICENSE_IMAGE_APPLICATION-6-LICENSE_LEVEL: Module name = c2900 Next reboot level = securityk9 and License = securityk9*Jun 15 01:31:55.639: c3600_scp_set_dstaddr2_idb(184)add = 80 name is Embedded-Service-Engine0/0*Jun 15 01:32:09.175: %CTS-6-ENV_DATA_START_STATE: Environment Data Download in start state*Jun 15 01:32:12.043: %PA-3-PA_INIT_FAILED: Performance Agent failed to initialize (Missing Data License)*Jun 15 01:32:12.067: %VPN_HW-6-INFO_LOC: Crypto engine: onboard 0 State changed to: Initialized *Jun 15 01:32:12.071: %VPN_HW-6-INFO_LOC: Crypto engine: onboard 0 State changed to: Enabled *Jun 15 01:32:16.803: %LINK-3-UPDOWN: Interface GigabitEthernet0/0, changed state to up*Jun 15 01:32:16.803: %LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to up*Jun 15 01:32:17.619: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to down*Jun 15 01:32:17.851: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0, changed state to up*Jun 15 01:32:17.851: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to up*Jun 15 01:32:18.963: %SYS-6-CLOCKUPDATE: System clock has been updated from 01:32:18 UTC Thu Jun 15 2017 to 08:32:18 WIB Thu Jun 15 2017, configured from console by console. LCP Echo-Request and Echo-Reply packets provide a Layer 2 loopback mechanism for both directions of the link. This table lists the three classes of LCP packets: LCP is used to establish the connection through an exchange of Configure packets. Refer to Cisco Technical Tips Conventions for more information on document conventions. The autostate feature is not synchronized with the STP state. Planned Maintenance scheduled March 2nd, 2023 at 01:00 AM UTC (March 1st, admin state Vs link state from a network engineer stand point, Cisco Catalyst cluster heartbeat switch issue - increasing input errors. loopbackIndicates whether loopback is set. Thestandby preemptcommand enables the Hot Standby Router Protocol (HSRP) router with the highest priority to immediately become the active router. If your network is live, ensure that you understand the potential impact of any command. Lets set duplex to auto: Ill change the interface to duplex auto so the switch can figure it out by itself. For more information on document conventions, see the Cisco Technical Tips Conventions. Lets take a look at the following situation: In the topology above, someone connected a cheap (unmanaged) switch that they brought from home to the FastEthernet 0/1 interface of our Cisco switch. 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. Is variance swap long volatility of volatility? This document is not restricted to specific software and hardware versions. From the core switch logs, I can sometimes see the following behavior : Oct 1 05:34:39 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan2, changed state to up. Corgon-6000# Mar 11 12:11:23.406: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan151, changed state to up. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. According to point 3 as I understand Yes, the 2960 is connected to the CORE2 with a L2 link (access port in the VLAN2). Failure of the port to come up or ping itself with a local loop indicates a problem with the Cisco Router. Start by replacing the cable connected to the port with a new one. Priority is determined first by the configured priority value, and then by the IP address. Debugging during these periods decreases the likelihood that increased debug command processing overhead affects system use. If we want, we can change this behavior with port security. The best answers are voted up and rise to the top, Not the answer you're looking for? No, it is point-to-point at layer-3. Learn more about how Cisco is using Inclusive Language. The best answers are voted up and rise to the top, Not the answer you're looking for? Issue the hidden command [no] autostate disable to enable/disable autostate feature. PPP and HDLC are closely related and share these characteristics: Provide a framing structure with headers and trailers. RFC 2615 specifies the use of PPP encapsulation over SONET or SDH links. Change the cables and SFP. Symptom: Dec 30 03:34:54: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/26, changed state to down Dec 30 03:35:04: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/26, changed state to up Dec 30 03:49:50: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/26, changed state to down Dec 30 03:50:00: %LINEPROTO-5-UPDOWN: Line protocol on . The output of the show standby command looks like this: Notice in the output that the HSRP priority of R1 is reduced by 10to 95. 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. "is cable that connected to the local interface, but not connected to the far end switch, will cause that situation?" Now, if the R1 serial 0 interface comes back up, the R1 priority is 105, again. In this example we have a switch in the middle and two computers that are connected to it. Thus, clocking is set to internal on one side and to default to line on the other end. %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to down. Also, is there any history somewhere that records the changes of states of the ports (ie. To sugget better, we would like to see your configuraiton and topology ? The frame format for PPP in HDLC-like framing is shown in this figure. Sometimes people like to bring an extra switch from home to the office. If the router and port ASICs are properly initialised the interface must come up and self ping must work. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. In contrast, HDLC must time out the keepalives. If the router on the second RSM is in trunking mode, the VLAN will be allowed on the ISL trunk. - Hire additional resources to help monitor and manage your network infrastructure. By default, there is no limit to the number of MAC addresses a switch can learn on an interface, and all MAC addresses are allowed. Here is why: Hi, your lessons are very interesting. Configure the interface in local loopback. Thats looking better! Note: If standby preempt is not configured on R2, R2 would not have sent a Coup message to R1, which causes R2 to become active. The autostate feature is synchronized with the STP state. Hi, can you provide the configs of 3 switches? from 2960 to 3750 to Core ? 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. This is the symptom of a VLAN interface on the MSFC being down/down. (Refer to the APS Technology Support Page for more information.). Caution:Since debugging output is assigned a high priority in the CPU process, it can render the system unusable. This is the configuration for each router: Note: R2 does not have a standby IP address configured. Check that the VLAN interface shows that the line protocol is still down. At least one L2 (access port or trunk) port exists and has a link up on this VLAN. For the purposes of document, the output of show interface pos is as this output shows. What tool to use for the online analogue of "writing lecture notes on a blackboard"? The sender of the Terminate-Request should disconnect after receiving a Terminate-Ack, or after the Restart counter expires. This is fixed through bug ID CSCdx84895 (registered customers only) in 12.1.13E and later releases. How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? 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. Use the switchport port-security mac-address command to define the MAC address that you want to allow. *Jun 15 01:32:17.619: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to down *Jun 15 01:32:17.851: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0, changed state to up . Note that this interface is running in half duplex. Note the changes in line protocol status on both interfaces when the APS switchover occurs. - Consolidate network resources down to one or two switches. The documentation set for this product strives to use bias-free language. Find answers to your questions by entering keywords or phrases in the Search bar above. Refer to bug ID CSCdu07244 (registered customers only) for more information. Ethernet0 is administratively down, line protocol is down: This output indicates that a local interface has been manually shut down using the shutdown command. One of these is for a 2.5Gbps link that the switch was plugged into. Learn more about how Cisco is using Inclusive Language. This means that another HSRP router with higher priority can become the active router if that router has the standby preempt enabled. HDLC is an international standard, but vendor implementations vary one or more fields or the header or trailer in size and format. The router VLAN interfaces have to fulfill the following general conditions to be up/up: VLAN exists and is in active status on the switch VLAN database. I have configured port security, so only one MAC address is allowed. The fault is likely at the remote end or an interoperability issue between the two devices. Refer to Cisco bug IDCSCdp72834 for more information. Can the Spiritual Weapon spell be used as cover? Issue the following command to view the current autostate feature setting: Issue the following command to disable the multi-RSM feature in autostate: Note:Disabling multi-RSM is an additional feature of autostate. Suspicious referee report, are "suggested citations" from a paper mill? Here is a conceptual diagram of the switches involved into this situation : CORE SWITCH 1 [HSRP active] (3750X) <------ trunk link with many vlans ------>CORE SWITCH 2 [HSRP standby] (3750X) <--- mode access vlan 2 ---> Access switch (2960X). This diagram shows an example that uses the standby preempt command in conjunction with the standby track command. 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). 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. This allows traffic to flow between the two RSMs on that VLAN without disabling the autostate feature. Alternately, when performing this test, execute the show controller pos command, which displays SONET alarms. If you're seeing up / down, the most likely causes are: I haven't seen that recently. Standby Preempt and Standby Track Configuration. And if the cable is bad? If the output of the show interfaces pos command indicates that the serial line is up but the line protocol is down, use loopback tests to determine the source of the problem. Provide frame delineation, which defines for a receiver exactly where a packet and frame begins and ends. When R2 becomes the active router all the traffic from the hosts to the servers is routed through R2. For this reason, use debug commands only to troubleshoot specific problems or during troubleshooting sessions with Cisco technical support staff. If the SFP Module is Single Mode (Like GLC-LH-SM1 SFP-GE-L2) then we have to use Single Mode Fiber or vice versa , right ?? 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. This is the symptom of a VLAN interface being in up/down status. If the problem persists, check other hardware components. The open-source game engine youve been waiting for: Godot (Ep. Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? Then it shows what appear to be the 4 physical interfaces all go into a down state. There are no specific requirements for this document. Side A would be admin down, and side B would be down/down. Lets walk through a couple of scenarios. Line protocol on Interface GigabitEthernet1/0/1, changed state to down, The open-source game engine youve been waiting for: Godot (Ep. GigabitEthernet interfaces can test all four pairs. Autostate is implemented on CatOS and IOS Cisco based switches by default. I don't know why, but the switch couldn't work properly with that port. New here? The standby track command allows you to specify another interface on the router for the HSRP process to monitor in order to alter the HSRP priority for a given group. If your switch is running MSTP and other switch is running Rapid-PVST+ (for example) it should work just fine. Switch interfaces are layer-2 interfaces, but if you can address it, then you have enabled layer-3 and it is a router interface. 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). New here? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. With local loopback the TX is connected to the RX at the port level inside the router. Click the card to flip Definition 1 / 4 whick menas that keepalives will not be receiver on the far end. If the cable is faulty, it could cause up / down status. If it doesn't, consider the switch port defective. Why was the nose gear of Concorde located so far aft? 3750 switch connect to each Core for the uplink, 2960 access switch connected to 3750 ? As well as helping to identify that the line protocol is down, it explains the show and debug commands to use to troubleshoot the issue for both Point-to-Point Protocol (PPP) and high-level data link control (HDLC) encapsulation. Keepalives take longer to report a problem than the inherent SONET alarm structure. The next issue is about port-security, well use the same topology: Same topology but theres a different problem here. Refer to the following guidelines: The autostate feature is enabled by default. If you are working in a live network, ensure that you understand the potential impact of any command before using it. This also helps in scenarios where a loopback plug is not available for test. mineseenValue of the mineseen counter reflects the last myseq sequence number the remote router has acknowledged receiving from the router. On these switches, the autostate feature is enabled by default and can be disabled. Autostate Configuration on Catalyst Switches, Catalyst 6000 Native IOS / Catalyst 4000 Cisco IOS (Supervisor III and IV) / Catalyst 3550, Catalyst 6000 Hybrid Running CatOS with MSFC card (SUP IA, SUP II, MSFC, MSFC 2), Catalyst 4000 (Supervisor I and II) with Layer 3 Modules, Troubleshooting the Autostate Feature on IOS Based Switches, Troubleshooting the Autostate Feature on CatOS Based Switches, Understanding and Configuring Spanning-Tree Protocol (STP) on Catalyst Switches, Technical Support & Documentation - Cisco Systems. . The sc0 should always be up after the switch boots. 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. 10:55 PM - 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. POS interfaces support PPP in High-Level Data Link Control (HDLC)-like framing, as specified in RFC 1662 , for data encapsulation at Layer 2. And as you can see, the HSRP state is therefore impacted. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. 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. When you finish using a debug command, remember to disable it with its specific no debug command or with the no debug all command. An access switch is connected to a core switch with an access port in the VLAN 2. Cisco Gigabit Ethernet Transceiver Modules Compatibility Matrix. This is sample output from the debug serial interface command for an HDLC connection when the remote interface is shut and the local interface misses more than three keepalives. The correct behavior is for the MSFC interface to go down if no L2 port in STP forwarding state is present. Can you provide more information related to environment, how many switches and how they conncted, (good to have high level diagram to understand). 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. HDLC is the default encapsulation type on a POS router interface. *Aug 8 11:18:12.081: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down What facility generated this message? IdentifierOn transmission, the Identifier field must be changed whenever the content of the Data field changes, and whenever a valid reply has been received for a previous request. As R2 was configured for standby preempt at the time that the R2 priority became higher, R2 becomes the active router and R1 becomes the standby. If you are lucky you might get a duplex message through CDP that tells you that there is a duplex mismatch. Can you post the configuration and spanning-tree config ? as in example? Lets try a ping: Unfortunately our pings are not working. Ping from one VRF to the other VRF. 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? Line protocol on Interface Vlan changed state to up. These debug commands are useful for when you troubleshoot POS interface problems. This also prevents other problems, such as routing black holes, from occurring. Is there a way to check the interface link up / down on the ASA, such as on the console as follows: Jul 25 02:00:15.268: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/1, changed state to up Jul 25 02:00:17.903: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/1, changed state to down Jul 25 02:00:18.903: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/1 . when HSRP failing - this could be low reasons. Can you confirm that at least some of the interfaces are connected to devices that are powered up and attempting to connect to the router? All of the devices used in this document started with a cleared (default) configuration. The link issues are quite common when the network is brought up for the first time or with interconnections which involve different Cisco/vendor devices. This interface, however, can be forced to administratively down. Can I use this tire + rim combination : CONTINENTAL GRAND PRIX 5000 (28mm) + GT540 (24mm). Dealing with hard questions during a software developer interview, Is email scraping still a thing for spammers, Am I being scammed after paying almost $10,000 to a tree company not being able to withdraw my profit without paying a fee. The sc0 should always be up after the switch boots. Asking for help, clarification, or responding to other answers. - Use a remote access utility such as SSH to access router and switch consoles remotely. You need to verify spanning-tree port status on the L2 port (should be forwarding). The command below shows that the VLAN exists and is active on the switch. Enable port 3/1, as shown below. This document discusses why this happens, and how the L3 and L2 interfaces interact with each other in the control plane after being activated. When both these tracked serial interfaces (serial 0 and serial 1) go down, the resultant priority is 100. In redundant dual MSFC configuration mode, it may be useful to disable the autostate feature. Which of the following is a standard for sending log messages to a central logging server? It is possible that no device is connected to the interface or that the link has cabling or auto-negotiation issues preventing the link from being up. Our interfaces of course! 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. Since the only port (3/1) is diabled, !--- the line protocol for interface VLAN 151 is down. 03-08-2019 Thank you for your response , this is my complete log that i have, =~=~=~=~=~=~=~=~=~=~=~= PuTTY log 2017.06.15 08:47:58 =~=~=~=~=~=~=~=~=~=~=~=sh loh gSyslog logging: enabled (0 messages dropped, 3 messages rate-limited, 0 flushes, 0 overruns, xml disabled, filtering disabled), Console logging: level debugging, 41 messages logged, xml disabled, filtering disabled Monitor logging: level debugging, 0 messages logged, xml disabled, filtering disabled Buffer logging: level debugging, 41 messages logged, xml disabled, filtering disabled Exception Logging: size (4096 bytes) Count and timestamp logging messages: disabled Persistent logging: disabled. POS interfaces support multiple encapsulations - HDLC, PPP and Frame Relay. 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. 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 section provides a basic overview of autostate configuration on Catalyst switches. What we see so far seems to begin with a normal boot process. This problem is resolved in Cisco bug ID CSCdp86387 (registered customers only) . What can cause "FastEthernet is up, line protocol is down" on a Cisco Switch? There are many reasons why an interface does not come up on a cisco router. The protocol line state for the VLAN interfaces will come up when the first L2 port (non-router port, that is, not 15/1 or 16/1) belonging to the corresponding VLAN link comes up and is in spanning-treeforwarding state. Issue the following commands to check the status of all conditions during troubleshooting: sh int
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