[j-nsp] MX960 JunOS recommendations

[sthaug at nethelp.no]

> > 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.
> 
> Except when you enable VLANs on Ethernet, you need to crank it up to 
> 4488.. A thing to keep in mind and/or to monitor using scripts.

Absolutely. We use quite a bit of dual tagging on Ethernet, so then we
need to crank it up to 4492. But all our backbone links are 4484 on the
Juniper side.

Steinar Haug, Nethelp consulting, sthaug at nethelp.no