By default, whenever any QoS marked traffic is sent into an SP environment, it is maintained from the source device until it hits the destination device.
We'll Telnet from IOS17 to IOS18 and look at wireshark outputs from CSR1 towards CSR3 and then CSR5 out to IOS18.
IOS17#telnet 10.101.18.18 /source-interface loopback 101
IOS18>en
% No password set
We'll Telnet from IOS17 to IOS18 and look at wireshark outputs from CSR1 towards CSR3 and then CSR5 out to IOS18.
IOS17#telnet 10.101.18.18 /source-interface loopback 101
IOS18>en
% No password set
The above output shows the MPLS header with EXP 6.
Here we see that the CS6 IPv4 packet header is visible.
IOS18# show ip access-lists
Extended IP access list QOS
10 permit ip any any dscp cs1
20 permit ip any any dscp cs2
30 permit ip any any dscp cs3
40 permit ip any any dscp cs4
50 permit ip any any dscp cs5
60 permit ip any any dscp cs6 (250 matches)
70 permit ip any any dscp cs7
80 permit ip any any
Extended IP access list QoS_MARKINGS
10 permit tcp any eq telnet any
15 permit tcp any any eq telnet (26 matches)
20 permit ip any any (77 matches)
IOS18#show policy-map control-plane input
Control Plane
Service-policy input: PM_COPP
Class-map: CM_COPP (match-any)
250 packets, 17469 bytes
5 minute offered rate 0000 bps
Match: access-group name QOS
250 packets, 17469 bytes
5 minute rate 0 bps
Class-map: class-default (match-any)
213 packets, 24513 bytes
5 minute offered rate 0000 bps, drop rate 0000 bps
Match: any
IOS18# show ip access-lists
Extended IP access list QOS
10 permit ip any any dscp cs1
20 permit ip any any dscp cs2
30 permit ip any any dscp cs3
40 permit ip any any dscp cs4
50 permit ip any any dscp cs5
60 permit ip any any dscp cs6 (250 matches)
70 permit ip any any dscp cs7
80 permit ip any any
Extended IP access list QoS_MARKINGS
10 permit tcp any eq telnet any
15 permit tcp any any eq telnet (26 matches)
20 permit ip any any (77 matches)
IOS18#show policy-map control-plane input
Control Plane
Service-policy input: PM_COPP
Class-map: CM_COPP (match-any)
250 packets, 17469 bytes
5 minute offered rate 0000 bps
Match: access-group name QOS
250 packets, 17469 bytes
5 minute rate 0 bps
Class-map: class-default (match-any)
213 packets, 24513 bytes
5 minute offered rate 0000 bps, drop rate 0000 bps
Match: any