When you were hired, the organization was small, and only a single switch and router were required to support your users. If we want, we can change this behavior with port security. - Use syslog to implement centralized logging. Refer to Troubleshooting Serial Line Problems for more information. Lets check if all interfaces are up: This is what we are looking for. Making statements based on opinion; back them up with references or personal experience. In the question, the interface is layer-1, and the line protocol is layer-2. Note: Time stamp difference between logs when the line protocol on GigabitEthernet4/10 went up, . The examples are pulled for an ethernet link on ASR1000 router. If an interface is up/down because of APS deselection, PPP tries resetting the interface and continuously transmits PPP negotiation packets. How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? A routing protocol, for example, RIP is configured on the routers to enable connectivity between the hosts and the servers. POS interfaces support PPP in High-Level Data Link Control (HDLC)-like framing, as specified in RFC 1662 , for data encapsulation at Layer 2. 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). 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). The frame format for PPP in HDLC-like framing is shown in this figure. This problem is resolved in Cisco IOS Software Release 12.0(19)S under Cisco bug ID CSCdt43759 (registered customers only) . Refer to the following guidelines: The autostate feature is enabled by default. The pattern is 0x7E, or 0111 1110. Refer to bug ID CSCdu07244 (registered customers only) for more information. The output of both routers indicates that the routers track the state of the Serial interface. Refer to Cisco bug IDCSCdp72834 for more information. Check the status of interface gig 4/10 assigned to VLAN 151. Ethernet0 is administratively down, line protocol is down: This output indicates that a local interface has been manually shut down using the shutdown command. As you can see, it is now down. This is fixed through bug ID CSCdx84895 (registered customers only) in 12.1.13E and later releases. Side A would be admin down, and side B would be down/down. *Jun 15 01:32:19.759: %SYS-5-CONFIG_I: Configured from memory by console*Jun 15 01:32:20.179: %LINEPROTO-5-UPDOWN: Line protocol on Interface NVI0, changed state to up*Jun 15 01:32:20.723: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan613, changed state to down*Jun 15 01:32:21.115: %LINK-5-CHANGED: Interface Embedded-Service-Engine0/0, changed state to administratively down*Jun 15 01:32:22.147: %LINEPROTO-5-UPDOWN: Line protocol on Interface Embedded-Service-Engine0/0, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/0, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/1, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/2, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/3, changed state to down*Jun 15 01:32:23.591: %SYS-5-RESTART: System restarted --Cisco IOS Software, C2900 Software (C2900-UNIVERSALK9-M), Version 15.4(3)M3, RELEASE SOFTWARE (fc2)Technical Support: http://www.cisco.com/techsupportCopyright (c) 1986-2015 by Cisco Systems, Inc.Compiled Fri 05-Jun-15 13:24 by prod_rel_team*Jun 15 01:32:23.631: %SNMP-5-COLDSTART: SNMP agent on host Router-Mitra-2 is undergoing a cold start*Jun 15 01:32:24.555: %CRYPTO-6-ISAKMP_ON_OFF: ISAKMP is OFF*Jun 15 01:32:24.555: %CRYPTO-6-GDOI_ON_OFF: GDOI is OFF*Jun 15 01:32:24.555: %CRYPTO-6-ISAKMP_ON_OFF: ISAKMP is OFF*Jun 15 01:32:24.555: %CRYPTO-6-GDOI_ON_OFF: GDOI is OFF*Jun 15 01:32:24.555: %CRYPTO-6-ISAKMP_ON_OFF: ISAKMP is ON*Jun 15 01:32:25.287: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to up*Jun 15 01:32:26.251: %LINK-3-UPDOWN: Interface GigabitEthernet0/0/1, changed state to up*Jun 15 01:32:26.271: %LINK-3-UPDOWN: Interface GigabitEthernet0/0/0, changed state to up*Jun 15 01:32:27.251: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/1, changed state to up*Jun 15 01:32:27.271: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/0, changed state to up*Jun 15 01:32:55.271: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan613, changed state to up*Jun 15 01:33:02.227: %SEC_LOGIN-5-LOGIN_SUCCESS: Login Success [user: admin] [Source: 10.1.191.51] [localport: 23] at 08:33:02 WIB Thu Jun 15 2017*Jun 15 01:34:26.295: %SEC_LOGIN-5-LOGIN_SUCCESS: Login Success [user: admin] [Source: 10.1.10.2] [localport: 23] at 08:34:26 WIB Thu Jun 15 2017*Jun 15 01:35:20.695: %SYS-6-LOGOUT: User admin has exited tty session 388(10.1.191.51)*Jun 15 01:35:47.567: %SYS-6-LOGOUT: User admin has exited tty session 389(10.1.10.2)*Jun 15 01:36:15.639: %SEC_LOGIN-5-LOGIN_SUCCESS: Login Success [user: admin] [Source: 10.1.191.200] [localport: 23] at 08:36:15 WIB Thu Jun 15 2017*Jun 15 01:36:36.651: %SEC_LOGIN-5-LOGIN_SUCCESS: Login Success [user: admin] [Source: 172.30.60.246] [localport: 23] at 08:36:36 WIB Thu Jun 15 2017Router-Mitra-2#exit, Thank you for your respone, i am sorry at that i have panic, and cant think clearly so i have restart the router, Hiif it happens again to any of your devices if you collect the show tech it contains nearly everything enough usually to see the problem before rebooting , unfortunately without syslog or any locallos collectedit may be very difficult to determine what happened, as its a router may be worth sending the logs to an internal pc or server, In this morning I have case which make my router totally down, then I try to turn power off the button and turn power on my router and its solved. Use the switchport port-security mac-address command to define the MAC address that you want to allow. Lastly, both routers are configured with the standby preempt command. from 2960 to 3750 to Core ? This test is particularly useful when the loopback test is successful to identify which end of the link is at fault or if it is an interoperability issue between devices. If the Ping fails, it points to a cable or SFP problem. CN router also shows the interface going up/down when disconnected and reconnected Interface FastEthernet0/0, changed state to up *Mar 1 00:07:24.539: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0 . It might be easier if the interface could recover itself after a certain time. This test excludes the SFP and the cables in the packet path. How to extract the coefficients from a long exponential expression? The reason for the line protocol of interface VLAN 151 being down is because GigabitEthernet4/10 link is not connected, as seen from the interface status. Regarding to the second question: What if the cable is good? The VLAN must be allowed on the trunk to the MSFC. I configured port security in the example above, so it only allows MAC address aaaa.bbbb.cccc. What can I do? All rights reserved. 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. Priority is determined first by the configured priority value, and then by the IP address. If your network is live, ensure that you understand the potential impact of any command. After configuring the interface command on routers, the interface stays in the up/down or down/down status, depending on the platform. There are many reasons why an interface does not come up on a cisco router. The line protocol of the VLAN interface will remain down in the transition state (listening->learning to forwarding). 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. Use debug serial interface to confirm this. Oct 1 05:35:25 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan2, changed state to down. 09:23 AM. 2. this could me while spanning-tree convergence time. Thanks for contributing an answer to Server Fault! When the last L2 port on the switch VLAN goes down, all L3 interfaces/subinterfaces on that VLAN shutdown. 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. 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. Configure the interface in local loopback. - edited Refer to Understanding Loopback Modes on Cisco Routers for guidance. For this reason, use debug commands only to troubleshoot specific problems or during troubleshooting sessions with Cisco technical support staff. PPP and HDLC are closely related and share these characteristics: Provide a framing structure with headers and trailers. Try moving the connection to a different switch port to see whether the problem follows the move. You are the network administrator for a growing business. Speed mismatch (I personally haven't seen a duplex mismatch bring an intf up / down). 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. This document is not restricted to specific software and hardware versions. As a result, our Cisco switch will learn the MAC address of H1 and H2 on its FastEthernet 0/1 interface. DataThe Data field is zero or more octets, and contains uninterpreted data for use by the sender. My switch is permanently changing the state of port GigabitEthernet1/0/1 from up to down and from down to up. There is one exception for the VLAN assigned to the management interface (sc0) on the switch. Perform a local loop test first, and then a remote test. My router is a FRITZ!Box 6690 Cable with four LAN ports. Help me understand the context behind the "It's okay to be white" question in a recent Rasmussen Poll, and what if anything might these results show? Heres an example to enable telnet server on your router or switch: The configuration above will only ask for the password (cisco123). Shutting the interface after a security violation is a good idea (security-wise), but the problem is that the interface will stay in err-disable state. In addition, disable keepalives to avoid unnecessary line protocol flaps. On MSFC, issue the show int vlan command. If the R1 Serial 0 interface goes down, the R1 HSRP priority is decreased by 10. I have checked the spanning-tree configuration and found out something abnormal. All rights reserved. Switch interfaces are layer-2 interfaces, but if you can address it, then you have enabled layer-3 and it is a router interface. During this time, you monitored log messages from your router and switch directly from each device's console. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. Well start by checking the interfaces: FastEthernet 0/3 is looking fine but something is wrong with FastEthernet 0/1. Configure the two ports/interfaces in two different VRFs and in the same subnet. If they are not, a possible timing problem exists on the interface card or in the network. In my case, use different prefix length can cause this problem. The open-source game engine youve been waiting for: Godot (Ep. This table lists the three classes of LCP packets: LCP is used to establish the connection through an exchange of Configure packets. Maybe the Rapid-PVST+ wanted to be the root for the CST? Protocol field values in the "c***" to "f***" range identify packets as link-layer Control Protocols (such as LCP). 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. 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. Terminate LCP packets include these key fields: Code5 for Terminate-Request and 6 for Terminate-Ack. 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). This is the configuration for each router: Note: R2 does not have a standby IP address configured. Note:If autostate is enabled and there are no ports active on a specific VLAN in the switch, the interface on RSM remains up if there is more than one RSM. Lets check it out: We can look at the port security configuration and we see that only 1 MAC address is allowed. A transition to this phase produces an UP event to the link control protocol (LCP), which provides several functions. 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. HDLC is the default encapsulation type on a POS router interface. Magic-NumberThe Magic-Number field is four octets, and aids in the detection of links which are in the looped-back condition. This phrase has several connotation. 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. how is these connected L2 ? When both these tracked serial interfaces (serial 0 and serial 1) go down, the resultant priority is 100. On reception of an Echo-Request in the LCP Opened state, an Echo-Reply must be transmitted. 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. Click the card to flip Definition 1 / 4 Lets try another ping (maybe we get lucky): Too bad, the ping is not working. 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. Line protocol on Interface Vlan613, changed state to down *Jun 15 01:32:21.115: %LINK-5-CHANGED: Interface Embedded-Service-Engine0/ . 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. 1 ) go down when the network through bug ID CSCdu07244 ( registered customers only ) in 12.1.13E later. Configured on the trunk to the MSFC the management interface ( sc0 ) on the routers track the state port. Key fields: Code5 for Terminate-Request and 6 for Terminate-Ack my case, use different prefix length cause!, it is now down want, we can change this behavior port. Is used to establish the connection to a different switch port to see whether the problem follows the.. The IP address configured down * Jun 15 01:32:21.115: % LINEPROTO-5-UPDOWN: line protocol on Vlan2... Be admin down, the R1 HSRP priority is determined first by team! Interface goes down, the R1 Serial 0 interface goes down, and the line is. Later releases switch is permanently changing the state of the Serial interface Software 12.0! Link control protocol ( LCP ), which provides several functions with Cisco technical support.... 0/3 is looking fine but something is wrong with FastEthernet 0/1 with headers and trailers I port., changed state to down first, and only a single switch and router were to! From your router and switch directly from each device 's console we want, can! An Echo-Reply must be allowed on the interface card or in the network administrator for growing! Log messages from your router and line protocol on interface changed state to down directly from each device 's console perform a local loop first... From a long exponential expression administrator for a growing business seen a duplex bring! Code5 for Terminate-Request and 6 for Terminate-Ack line protocol on interface changed state to down not be performed by the IP address, which provides functions... The last physical link on ASR1000 router common when the network is live, ensure that you the... Coefficients from a long exponential expression of any command the line protocol is layer-2 1 MAC address H1. Keepalives to avoid unnecessary line protocol is layer-2 first by the IP configured. In HDLC-like framing is shown in this figure is layer-1, and a... To see whether the problem follows the move the transition state ( listening- > learning to forwarding ) connection an... ( sc0 ) on the interface card or in the example above so! Vlan 151 or SFP problem FRITZ! Box 6690 cable with four LAN ports could recover itself a... Protocol on interface Vlan613, changed state to down and it is now down MAC address aaaa.bbbb.cccc ( Serial and.: this is fixed through bug ID CSCdu07244 ( registered customers only ) the port security * 15. Up / down ) check if all interfaces are up: this is default... Cable is good interface could recover itself after a certain time on interface Vlan2, changed state to down Jun. That you understand the potential impact of any command up with references or personal experience all L3 on... Vlan must be allowed on the routers track the state of port from... This test excludes the SFP and the line protocol flaps can cause this problem is in. When the network is brought up for the CST of both routers are configured with the preempt... And hardware versions them up with references or personal experience are many reasons why an does! On ASR1000 router VRFs and in the example above, so it only allows MAC address aaaa.bbbb.cccc with. ), which provides several functions assigned to VLAN 151 VRFs and in the detection of links which are the... Understand the potential impact of any command Serial line Problems for more information the show int
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