Re: Best way to have redundancy announcing on separate routers

[Bryan Fields <Bryan () bryanfields net>]

On 12/26/24 8:24 AM, Saku Ytti wrote:
> On Thu, 26 Dec 2024 at 05:55, Bryan Fields <Bryan () bryanfields net> wrote:
>
> > vlan {
> >   unit 405 {
> >     family iso {
> >     # holy shit this is important.  CISCO and Juniper will not talk unless the
> > MTU is set
> >         mtu 1492;
> >       }
> >    }
> > }
> This is almost certainly the wrong solution to a real problem. Real
> problem being, you have MTU mismatch, and the wrong solution is you
> solve it for one ifa. You almost certainly want the MTU to be fixed in
> ifl or maybe even ifd.

I believe it was that one side was vlan tagged and the other wasn't or
something to the effect of how the ISO MTU was calculated in the classic-IOS
version vs. Junos.  As this was for less than a carrier grade setup (tactical
deployment during an hurricane) I didn't have time to get deep into it.  A
3945e isn't exactly current anyway.  I think the other juniper involved was a
4500, so kind of in the same age as the cisco.

-- 
Bryan Fields

727-409-1194 - Voice
http://bryanfields.net