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:[email protected]] 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: [email protected] To: [email protected] 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 _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp *** This Message Has Been Sent Using BlackBerry Internet Service *** _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp
