[c-nsp] Quick question on HSRP...

[Blake Dunlap]

I'm still waiting for the day that HSRP can use pure L2 addresses to
communicate and not burn 3 ips...


On Wed, Jan 1, 2014 at 5:38 AM, Gert Doering <gert at greenie.muc.de> wrote:

> Hi,
>
> On Tue, Dec 31, 2013 at 07:54:10PM +0000, Phil Mayers wrote:
> > On 31/12/2013 19:40, Gert Doering wrote:
> > >On Tue, Dec 31, 2013 at 03:59:18PM +0000, Phil Mayers wrote:
> > >>(Note that changing the HSRP version does not have this property; the
> > >>old vMAC will be removed from the FDB, and the box won't forward
> traffic
> > >>destined to it)
> > >
> > >Could someone remind me why I have to change HSRP to v2 to be able to
> >
> > Not sure about that - maybe some fixed-size field in the HSRPv1 packet?
> > Been a while since I looked at it in a sniffer.
>
> Having a different packet format for IPv6 makes sense, as, uh, it's not
> IPv4 anyway :-) - but forcing me to move our IPv4 HSRP groups to v2 (which
> incurs a reachability hit) to be able to enable *different* HSRP groups
> for IPv6 later on is just so slightly annoying.
>
> [..]
> > HSRP has a lot of weird edge cases on Cisco gear. IIRC a lot of them
> > relate to the size of the CPU MAC-address receive filter, and other
> > tedious crap that wouldn't matter if they moved off CPUs from last
> > millenium.
>
> True.  Plus programmers that have never worked with a real network,
> where things actually *evolve* over time...
>
> [..]
> > In fairness to Cisco, other vendors have blind spots. Juniper makes you
> > type a truly tedious amount of config to get VRRP working, though at
> > least commit scripts can automate that out of existence.
>
> True, that one was done by someone who never had to do a router setup
> as well, I bet.
>
> gert
>
> --
> USENET is *not* the non-clickable part of WWW!
>                                                            //
> www.muc.de/~gert/
> Gert Doering - Munich, Germany
> gert at greenie.muc.de
> fax: +49-89-35655025
> gert at net.informatik.tu-muenchen.de
>
> _______________________________________________
> cisco-nsp mailing list  cisco-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/
>