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hsrp flapping

Hi forum,

I had an incident I am not sure could be the cause of the flapping of my HRSP routers running on my core switches. One of the etherchannel port is having some problem, I have this vlan going up and down for a period of time, when we shut the port down, things were back to normal.

My management is sort of unhappy and wanted us to look for a better solution, Is there a way I can guide against this problem?

Thank you,

py

5 REPLIES

Re: hsrp flapping

Hi Paul

can you post out the error logs which you see over there in your boxes..

regds

Re: hsrp flapping

can you share topology of your network and current config with us?

Bronze

Re: hsrp flapping

hi

i think the only thing that lead to a hrsp flaping is the instability of your network , that can be a form of overload that prohibit hello packet from the active to reach the standby by the way the standby wait three times the hello interval you ve configured (hold timer) if it does not receive the hello it will suppose the active is dead and it will take over, but a little bit of time after the network is no longer overloaded , the hello reach the standby , the active in that case if it s configured to preempt it will take over and so on and so forth a kind of flapping .

HTH

please do rate if it does clarify

ovt Bronze
Bronze
Community Member

Re: hsrp flapping

Hi everyone,

 

Thanks for the help.

 

Attached is the configuration files for the two core switches at site A that was having problem, log is clear coz the switch was later rebooted.

 

the configuration is sort of like:

 

(Site A) C4006C4506===fiberportchannel10===(Site B)C4506C4006

 

some of the logs that i can get:

 

og Buffer (4096 bytes):

port-channel Port-channel14

*Dec 12 03:39:48: %EC-5-BUNDLE: Interface GigabitEthernet4/18 joined port-channel Port-channel14

*Dec 12 03:39:48: %EC-5-BUNDLE: Interface GigabitEthernet4/34 joined port-channel Port-channel11

*Dec 12 03:39:48: %EC-5-BUNDLE: Interface GigabitEthernet4/35 joined port-channel Port-channel11

*Dec 12 03:39:48: %EC-5-BUNDLE: Interface GigabitEthernet4/36 joined port-channel Port-channel11

*Dec 12 03:39:48: %EC-5-BUNDLE: Interface GigabitEthernet4/37 joined port-channel Port-channel15

*Dec 12 03:39:48: %EC-5-BUNDLE: Interface GigabitEthernet4/38 joined port-channel Port-channel15

*Dec 12 03:39:49: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/1, changed state to up

*Dec 12 03:39:49: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet2/5, changed state to up

*Dec 12 03:39:49: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/2, changed state to up

*Dec 12 03:39:49: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet2/6, changed state to up

*Dec 12 03:39:49: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet3/4, changed state to up

*Dec 12 03:39:49: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet3/5, changed state to up

*Dec 12 03:39:49: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet3/1, changed state to up

*Dec 12 03:39:49: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet3/2, changed state to up

*Dec 12 03:39:50: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet2/1, changed state to up

*Dec 12 03:39:50: %LINK-3-UPDOWN: Interface GigabitEthernet2/6, changed state to up

*Dec 12 03:39:54: %EC-5-BUNDLE: Interface GigabitEthernet4/33 joined port-channel Port-channel11

*Dec 12 03:40:26: %HSRP-6-STATECHANGE: Vlan156 Grp 156 state Listen -> Active

*Dec 12 03:44:10: %HSRP-6-STATECHANGE: Vlan150 Grp 150 state Standby -> Active

*Dec 12 03:44:10: %HSRP-6-STATECHANGE: Vlan151 Grp 151 state Standby -> Active

*Dec 12 03:44:11: %HSRP-6-STATECHANGE: Vlan152 Grp 152 state Standby -> Active

*Dec 12 03:44:11: %HSRP-6-STATECHANGE: Vlan154 Grp 154 state Standby -> Active

*Dec 12 03:44:11: %HSRP-6-STATECHANGE: Vlan158 Grp 158 state Standby -> Active

*Dec 12 04:04:22: %HSRP-6-STATECHANGE: Vlan11 Grp 11 state Standby -> Active

*Dec 12 04:04:22: %HSRP-6-STATECHANGE: Vlan12 Grp 12 state Standby -> Active

*Dec 12 04:04:22: %HSRP-6-STATECHANGE: Vlan13 Grp 13 state Standby -> Active

*Dec 12 04:04:22: %HSRP-6-STATECHANGE: Vlan14 Grp 14 state Standby -> Active

*Dec 12 04:05:24: %SYS-5-CONFIG_I: Configured from console by vty0 (172.16.145.59)

*Dec 12 04:06:28: %HSRP-6-STATECHANGE: Vlan41 Grp 41 state Standby -> Active

 

 

 

 

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