[nsp] Delay in MPLS PE lookup

Jon Lewis jlewis at lewis.org
Tue Jun 8 08:53:41 EDT 2004

On Tue, 8 Jun 2004, Eric Osborne wrote:

> It's really just because you have an extra routed hop in there.  With FR
> direct, it's
> CE1---CE2
> with the PEs, it's
> CE1---PE1---PE2---CE2
> where PE1 has to do a routing lookup (and impose a label), and PE2 has to
> pop a label and do a routing lookup.  Label operations are pretty much the
> same speed as routing lookups, so I'd expect to see the same delay whether
> it was MPLS-VPN or just regular IP between all 4 routers.

Label operations / IP routing / tag switching are sufficiently fast, that
I wouldn't expect to see them influence ping response times.  20ms/hop
over leased lines is kind of slow though.  What sort of lines are those?

What sort of ping times do you get from PE1 - PE2 and from each CE to
its PE?

 Jon Lewis                   |  I route
 Senior Network Engineer     |  therefore you are
 Atlantic Net                |
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