I'm testing QoS over a MPLS network on a lab. I reset QoS on the CE (R1)
inbound LAN interface, set the DSCP bit outbound to the WAN to af11. On the
PE (R5) router inbound I match the DSCP bit af11 and set the MPLS Exp bit to
1, and get match as below. The I have a outbound policy on the PE (R5)
FE0/0.1 sub-interface to the MPLS P (R4) node which 'match ip mpls exp 1'
and no packets match this policy as swon below(2):
The input policy (set-exp-in) does mark the packet, but the output policy
(test1) does't see marked mpls packets. Why?
r5#sh pol int s4/0
Serial4/0
Service-policy input: set-exp-in
Class-map: class-af11 (match-any)
117 packets, 5912 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: ip dscp af11
117 packets, 5912 bytes
5 minute rate 0 bps
QoS Set
mpls experimental 1
Packets marked 117
Class-map: class-default (match-any)
63 packets, 28040 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: any
r5#
r5#sh pol int f0/0.1
FastEthernet0/0.1
Service-policy output: test1
Class-map: test1 (match-any)
0 packets, 0 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: mpls experimental 1
0 packets, 0 bytes
5 minute rate 0 bps
QoS Set
ip precedence 1
Packets marked 0
Class-map: class-default (match-any)
66224 packets, 6229493 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: any
r5#
The lab with MPLS as follows :
R1 R5 R4 R2 R7 R8
CE --- PE --- P --- P --- PE --- CE
on R1 :
class-map match-any class-af11
match access-group name acl-af11
match ip precedence 1
policy-map class-wan-out
class class-af11
set ip dscp af11
ip access-list extended acl-af11
permit tcp any any eq domain
permit tcp any any eq echo
permit tcp any any eq telnet
permit tcp any any eq tacacs
on R5:
class-map match-any test1
match mpls experimental 1
match ip dscp af11
class-map match-any class-af11
match ip dscp af11
policy-map set-exp-in
class class-af11
set mpls experimental 1
policy-map test1
class test1
set ip precedence 1
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