It might be easier if the interface could recover itself after a certain time. To get the interface out of err-disable state you need to type “shutdown” followed by “no shutdown”. One or more logs will be seen when mac table exceeds capacity. This probably means another call to the helpdesk and you bringing the interface back to the land of the living! Let’s activate it again: Switch(config)# interface fa0/1 Description (partial) Symptom: When Catalyst 3850 stack exceeds the mac address limit (32768) and macs are learnt via a port channel, some MAC addresses may not age out indefinitely even after aging time expiry. The session timeout is the maximum time for a client session to remain active before requiring reauthorization. Session Timeouts You can configure a WLAN with a session timeout. Verify the current timeout by entering the show wlan command. To configure a static MAC address, the following command is used: (config. The static MAC entries will be retained even after the switch is restarted. A value of 0 permanently disables the client. Although Cisco switches dynamically build the MAC address table by using the source MAC address of the received frames, you can also manually add a MAC address to the switch’s MAC address table. 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. The valid timeout range is 1 to 2147483647 seconds. Sending 5, 100-byte ICMP Echos to 192.168.12.2, timeout is 2 seconds. Switch# show interfaces fa0/1įastEthernet0/1 is down, line protocol is down (err-disabled) MAC address entries in your Cisco Catalyst IOS Switch MAC address table. You can see the violation mode is shutdown and that the last violation was caused by MAC address 0e.5023 (H1). Use show port-security interface to see the port security details per interface. Here is a useful command to check your port security configuration. Last Source Address:Vlan : 0e.5023:1Security Violation Count : 1 Let’s take a closer look at port-security: Switch# show port-security interface fa0/1 We have a security violation and as a result the port goes in err-disable state. %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to down %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down %PORT_SECURITY-2-PSECURE_VIOLATION: Security violation occurred, caused by MAC address 0e.5023 on port FastEthernet0/1. %PM-4-ERR_DISABLE: psecure-violation error detected on Fa0/1, putting Fa0/1 in err-disable state I’m pinging to some bogus IP address…there is nothing that has IP address 1.2.3.4 I just want to generate some traffic. Now we’ll generate some traffic to cause a violation: C:\Documents and Settings\H1> ping 1.2.3.4 Use the switchport port-security mac-address command to define the MAC address that you want to allow. However we are well beyond that version of IOS, 12.2.18.Switch(config-if)# switchport port-security mac-address This bug would allow the global setting to be changed but not impact the individual vlans. What does the statement "Routed MAC aging time: 300 seconds" imply? I did a search on cisco's site and found one reference, indicating that there was a bug in the IOS that was fixed in 12.1.22. TPA-SWAsh switch Switch/Stack Mac Address : 1c6a.7ad3.0c80 H/W Current Switch Role Mac Address Priority Version State - 1 Master 1c6a.7ad3.0c80 15 1 Ready 2 Member 1cde.a722. No vlan age other than global age configured
Cisco mac address timeout plus#
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Get Cisco IOS in a Nutshell, 2nd Edition now with O’Reilly online learning. A setting of 0 (zero) disables the aging time. Valid times are 0 or from 10 to 1,000,000 seconds.
Cisco mac address timeout for mac#
But on my core switches, (6500 series), after I issue the command and then show the setting, I get the following: This command configures the aging time for MAC addresses in the MAC address table. I set the value on all my 3750's and did a show.each vlan shows 14440 as the timeout. Type this command: arp
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