[j-nsp] compound rewrite-rule

[Serge Vautour]

Hello,

Are you trying to rewrite the MPLS header and IP header inside the MPLS packet? 
I think you can do this. See:

http://www.juniper.net/techpubs/en_US/junos10.2/information-products/topic-collections/config-guide-cos/topic-27835.html#id-11667692


Serge



----- Original Message ----
From: Luca Tosolini <bit.gossip at chello.nl>
To: Lista-Juniper <juniper-nsp at puck.nether.net>
Sent: Mon, September 6, 2010 1:37:54 PM
Subject: [j-nsp] compound rewrite-rule

Experts,
on Mx and Junos 10.2R2.11
the following rewrite-rules configuration:
show configuration class-of-service interfaces xe-4/1/0  
unit 0 {
    classifiers {
        exp MPLS;
        ieee-802.1 DOT1P;
        inet-precedence TOS;
    }
    rewrite-rules {
        exp MPLS-RW;
        ieee-802.1 DOT1P-RW;
        inet-precedence TOS-RW;
    }
}

It looks like only one of the rewrite is executed but not all of them;
see the following capture of an egress frame:

sudo tcpdump -i eth1 -n -v -c1 mpls
tcpdump: WARNING: eth1: no IPv4 address assigned
tcpdump: listening on eth1, link-type EN10MB (Ethernet), capture size
65535 bytes
16:12:14.043480 MPLS (label 0 (IPv4 explicit NULL), exp 6, [S], ttl 62)
    IP (tos 0x0, ttl 63, id 0, offset 0, flags [none], proto UDP (17),
length 114)


Here exp=6 and tos=0 so for an MPLS packet only MPLS-RW is executed.
Instead on a IP frame I see that TOS-RW is executed.

So it looks that the rewrite-rules are NOT executed together on same
frame !!
Is this the wanted behavior?

Thanks,
Bit.

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