On 11/03/15 23:51, Nick Hilliard wrote:
On 11/03/2015 23:41, Cydon Satyr wrote:
I understand a proper maintenance window should be ordered, but, could
this be done with no downtime (or at least near 0, just so hosts update arp
table)? Any ideas?
Have you labbed this up?
You haven't, because you haven't yet run into the problem that you cannot
send a gratuitous ARP using e.g. ping on the VRRP virtual IP address. The
You can't do this with zero outage, but does VRRP not send a g-arp when
it becomes active on IOS?
If so, this might work
1. Shutdown hsrp slave
2. Configure VRRP group with fake IP, very short timers
3. "no standby" followed by "vrrp ..." to give it a real IP
The main risk is the g-arp being dropped/missed. It's a shame the
masters don't send several, spaced at $hello_timer interval or
something. This is a problem with changing HSRP group number too.
But it all depends if IOS VRRP will send a g-arp on "active"....
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