From: Tima Maryin <[email protected]> Subject: Re: [j-nsp] MX960 JunOS recommendations Date: Wed, 11 Nov 2009 17:11:56 +0300
> Uhm, i see your point here. > We indeed have cisco - cisco - Jun - Jun setup > > > My cisco interface mtu = ip mtu = mpls mtu =9000 > But i reeeealy doubt that bgp keepalive packet size can come close to that > mtu. > > > On Juniper i set interface mtu = cisco mtu +14 and it works fine! > And! As you say, it reports different mpls mtu value: Make sure that your IP MTU is the same on both Cisco and Juniper sides. If you run IS-IS, make sure your CLNS MTU is the same on both Cisco and Juniper sides. People have been running interoperable Cisco and Juniper networks for many years. This is not rocket science. We have standardized on 4470 byte MTU. This means mtu 4470 on Cisco IOS physical Ethernet interfaces, and MTU 4484 on Juniper JunOS physical Ethernet interfaces. No need to explicitly set IP or CLNS MTU. (Also no need to specify anything at all for SDH/SONET interfaces...) Steinar Haug, Nethelp consulting, [email protected] _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp
