[j-nsp] Mixed Cisco/Juniper MPLS network

[Mark Tinka]

On Thursday, August 15, 2013 05:48:24 PM Saku Ytti wrote:

> This has some scaling implications, back when we were not
> filtering label advertisements we exhausted M10i NHDB
> due to the labels.
> 
> It may also hurt convergence as rerouting needs to
> consider more next-hops.

Labels would only be assigned to IGP routes, which are 
typically limited to backbone and Loopback interfaces. As 
customer routes aren't carried in the IGP (unless you're my 
competitor, so go right ahead, hehe), that is not an issue.

Granted, you use more FIB slots than you would have if you 
were simply filtering against Loopback addresses, but this 
is a function of, as you say, scale, i.e., how many backbone 
links are in the network.

Also, this is less of a problem for newer platforms that 
have larger and/or discrete FIB's, and also quicker control 
planes.

If Cisco had a command that implemented the Junos behaviour, 
e.g,., "mpls ldp label allocation loopbacks-only" without 
needing to tinker around with filters, I'd be the first one 
to implement it :-).

Mark.
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