[c-nsp] MTU / BGP

[Gert Doering]

Hi,

On Mon, Jul 20, 2015 at 08:33:10PM +0000, CiscoNSP List wrote:
> Side note - It would be nice to be able to set mtu per neighbour purely for bgp (i.e. not have to change the physical Interface, or disable path mtu discovery)...

Side note - if you have a network where path mtu discovery fails and BGP 
sessions die as a consequence, something in your network is seriously broken.

Normally, even if MTUs on different links are different, pMTU discovery
gets it sorted out nicely.

Typical issues that are very much a recipe for trouble is when you have
a single layer2 network where different devices have different layer 3
MTUs.  Always ensure that *all* adjacent L3 devices agree on the 
IP/IPv6/MPLS MTU (and take into account the subtle differences between
IOS, IOS XR and JunOS...).

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
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