[j-nsp] JunOS QPPB

[Rafal Szarecki (WA/EPO)]

Ezequiel,
 
>         is there anyway to force a recursive route lookup so 
> junos could add the DCU flag to the packet. structure and 
> then applying the match criteria over this traffic?

Yes, but DCU flag can be used on egress interface only.
>           
>          Configuring L3VPN (VRF) over dot1 interface.... we 
> had the problem with 3 ways header packet loookup (MPLS 
> LABEL,IP DEST and MAC
> ADDRESS) and applying a static route /32 to the same host was 
> the solution, i.e.: 192.168.0.1/32 next-hop 192.168.0.1.  
> 
This solution is obvous. Your static route was create additional inner
label which is recognized be router as "local delivery" ad stripped on
ingress (from core) I/O Manager (Bi chip). Then Bi-chip creates  lookup
key which is of IP type. So Cf-chip (IP-2) make regular simple and
single IP lookup.

Without static route Junos do not generate labels for local address
(/32) but only for direct addresses (connected NETWORK). Ant label for
direct addresses prefix is processed by IP-2 to find egress nterface and
L2 encapsulation. 

> i was trying to force some kind of recursive lookup 
> and then send the flow to a routing instance or logical 
> router where a fowarding-option can be configured.
>

On M-series you can make multiple lookups fo the same lookup key. But
lookup key is small, so it can be IPv4 xor IPv6 xor MPLS xor Other. So
you can't make lookup for MPLS label and then IPv4 during single IP-2
visit.