[j-nsp] CoS clarification on MPLS interface

[Andrew Jimmy]

The question is not what to use (I do know we use EXP because packet is not
being processed on IP layer). The question was, what if you have configured
both DSCP/EXP classifier and rewriting rules on an MPLS switching interface
for the MPLS switching traffic (not regular IP traffic), what behavior would
you expect  from a Juniper J-Series or M-Series router. Will it use DSCP
classification or not? Will it rewrite DSCP value or not?

Regards,
Andrew

-----Original Message-----
From: Fahad Ali Khan [mailto:fahadak at cyber.net.pk] 
Sent: Sunday, May 24, 2009 9:03 PM
To: Andrew Jimmy
Subject: Re: [j-nsp] CoS clarification on MPLS interface

In my opinion n experience, on mpls core interface only EXP bits r used 4
classification n rewriting. DSCP based classification n rewriting b used
only when IP traffic (non switched) passed the interface.

Now ur question may b that in what scenario mpls interface b used 4 both
routing n mpls swutching. Consider if my policy is to carry only VPN traffic
over mpls lsp n won't used IGP forwarding to use LSP. In normal
circumstances only Mpls vpn (whose next-hop) is available via BGP in Inet3
table will use lsp...all other will follow IGP forwarding rules. Where this
behaviour can b changed.

Regards

Fahad
------Original Message------
From: Andrew Jimmy
Sender: juniper-nsp-bounces at puck.nether.net
To: juniper-nsp at puck.nether.net
Subject: [j-nsp] CoS clarification on MPLS interface
Sent: May 25, 2009 1:51 AM

Which policy will took place, if you apply a CoS DSCP/EXP classification and
DSCP/EXP rewrite policy on an MPLS switching interface (keeping in mind
packet is being switched using MPLS shim header), I know MPLS EXP
classification and rewriting will defiantly be used but what about DSCP
classification and rewriting. The confusing is packet is being switched on
MPLS header without touching regular IP header while DSCP value set in IP
header. I just wana know how Juniper router (J Series and M Series) treats a
packet in MPLS core facing interface while both DCSP/MPLS EXP classifier and
rewriting are configured.

 

OR in simple words . Is it possible to use DSCP classification/rewriting on
MPLS core interface (while packet is being switched using MPLS shim header).

 

Regards,

Andrew 

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