Saturday, September 20, 2008

VRRP - SLA tracking

Today I have been doing IPexpert's volume 1 section 14 and 15 labs. Section 15 has to do with router redundancy, namely HSRP, VRRP and GLBP. I ran into a tracking issue that stumped for a short time but I thought it would be wise to document it.

The task states that R2 should be master unless its ping time to exceeds 80ms. So I configure as follows:

track 2 rtr 1
ip sla monitor 1
type echo protocol ipIcmpEcho
threshold 80

int f1/0
vrrp 1 ip
vrrp 1 priority 105
vrrp 1 track 2

Immediately I see this on R2:

*Sep 20 22:18:20.107: %SYS-5-CONFIG_I: Configured from console by conso
*Sep 20 22:18:22.287: %VRRP-6-STATECHANGE: Fa1/0 Grp 1 state Master -> Backup

So I check my ping times:


Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to, timeout is 2 seconds:
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/9/12 ms

Way under 80 ms! What gives?

Turns out I never enabled the SLA!!

So I do this:

R2(config)#ip sla monitor schedule 1 start-time now
*Sep 20 22:20:04.883: %VRRP-6-STATECHANGE: Fa1/0 Grp 1 state Backup -> Master

I am glad this only took a few minutes to figure out but hopefully if you see this you will recognize the problem.

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