07-31-2008 01:53 AM - edited 03-06-2019 12:32 AM
I have two Catalyst 4507 as core switch. They are uplink with each other on redundent fiber cable. I am also running HSRP for each vlan configured on it. Everything was working fine. But this morning suddendly communication stop. No response of telnet. When I console the switch i found following errors on cosole
%% Low on memory; try again later
%% Low on memory; try again later
%% Low on memory; try again later
%% Low on memory; try again later
%% Low on memory; try again later
%% Low on memory; try again later
%% Low on memory; try again later
%% Low on memory; try again later
%% Low on memory; try again later
%% Low on memory; try again later
on the 2nd core switch i found this error on console
15w4d: %C4K_EBM-4-HOSTFLAPPING: Host 00:0E:0C:EB:37:2F in vlan 2 is flapping between port Gi3/1 and port Gi3/2
15w4d: %C4K_EBM-4-HOSTFLAPPING: Host 00:1D:45:61:A4:2B in vlan 3 is flapping between port Gi3/1 and port Gi3/2
15w4d: %C4K_EBM-4-HOSTFLAPPING: Host 00:0E:0C:C0:4B:50 in vlan 2 is flapping between port Gi3/2 and port Gi3/1
15w4d: %C4K_EBM-4-HOSTFLAPPING: Host 00:1D:45:61:A3:C5 in vlan 3 is flapping between port Gi3/2 and port Gi3/1
15w4d: %HSRP-4-DUPADDR: Duplicate address 172.28.63.66 on Vlan2, sourced by 0000.0c07.ac0a
Then i remove the rundent fiber uplink and switches start responding. Even after placing the redundent fiber uplink back starts working.
why i got memeory error on core switch 1 and why this happened. I didnt change anything for the last two months.
IOS Version is 12.2(25)EWA9
08-07-2008 11:14 AM
1) When this occurs, there is a possiblity of switch not having enough memory to process the control packets & may cause side effects like STP loop or EOBC cutoff.
2) This is triggered, by mere logging into the switch, entering the global config mode, exiting out & logging out. Each individual session leaks out memory. When you log into the switch and enter any configuration command, a block of memory that has the size of NVRAM leaks. Each time you start a new session and enter a configuration command, another block of memory leaks. The cumulative leak may consist of a significant amount of memory, depending upon the Supervisor.
3) Upgrade to later version
More informations can be provided by following links:
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat4000/
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