Troubleshooting QoS on a 3825

Unanswered Question
Sep 28th, 2008

The topology: (hopefully my ASCII drawing formats correctly)

-----------

[IPTube]-<vlan11>-[2970]-<vlan11>-[3825]-<vlan42>-[1811]-<vlan31>-[IPTube]

The IPTubes are from Engage and are TDM to IP devices that have been configured to mark packets with ToS 0x08 (DSCP 2).

The problem:

----------

In the 3825 -> 1811 direction, I can see DSCP 2 out VLAN31 - no problem:

3825#show policy-map int vlan42 output

Vlan42

Service-policy output: IPTube

Class-map: IPTube (match-all)

256763715 packets, 159450264603 bytes

5 minute offered rate 1655000 bps, drop rate 0 bps

Match: dscp 2

Queueing

Strict Priority

Output Queue: Conversation 264

Bandwidth 2000 (kbps) Burst 50000 (Bytes)

(pkts matched/bytes matched) 0/0

(total drops/bytes drops) 0/0

Class-map: class-default (match-any)

554345 packets, 319306444 bytes

5 minute offered rate 0 bps, drop rate 0 bps

Match: any

1811#show policy-map interface vlan31

Vlan31

Service-policy output: IPTube

Class-map: IPTube (match-all)

111002338 packets, 68932451910 bytes

5 minute offered rate 1655000 bps, drop rate 0 bps

Match: dscp 2

Queueing

Strict Priority

Output Queue: Conversation 264

Bandwidth 2000 (kbps) Burst 50000 (Bytes)

(pkts matched/bytes matched) 0/0

(total drops/bytes drops) 0/0

Class-map: class-default (match-any)

10599 packets, 635940 bytes

5 minute offered rate 0 bps, drop rate 0 bps

Match: any

In the 1811 -> 3825 direction however, I see DSCP 2 only as far as the vlan42 SVI facing the 3825. The 3825 doesn't seem to see the DSCP marking:

1811#show policy-map interface vlan42

Vlan42

Service-policy output: IPTube

Class-map: IPTube (match-all)

111036374 packets, 68953588269 bytes

5 minute offered rate 1656000 bps, drop rate 0 bps

Match: dscp 2

Queueing

Strict Priority

Output Queue: Conversation 264

Bandwidth 2000 (kbps) Burst 50000 (Bytes)

(pkts matched/bytes matched) 0/0

(total drops/bytes drops) 0/0

Class-map: class-default (match-any)

1584 packets, 224640 bytes

5 minute offered rate 0 bps, drop rate 0 bps

Match: any

3825#show policy-map interface vlan11 output

Vlan11

Service-policy output: IPTube

Class-map: IPTube (match-all)

0 packets, 0 bytes

5 minute offered rate 0 bps, drop rate 0 bps

Match: dscp 2

Queueing

Strict Priority

Output Queue: Conversation 264

Bandwidth 2000 (kbps) Burst 50000 (Bytes)

(pkts matched/bytes matched) 0/0

(total drops/bytes drops) 0/0

Class-map: class-default (match-any)

565011 packets, 31043926 bytes

5 minute offered rate 0 bps, drop rate 0 bps

Match: any

Anyone see anything fishy in the configs or in the software versions that might explain this?

SW versions:

----------

3825: 12.4(10) (Advanced IP Services)

1811: 12.4(6)T11 (Advanced IP Services)

Configs:

-------

! 1811

!

interface FastEthernet9

description ** TLS to 3825

switchport access vlan 42

!

interface Vlan42

ip address 10.79.253.6 255.255.255.252

no ip redirects

no ip unreachables

no ip proxy-arp

ip tcp adjust-mss 1412

service-policy output IPTube

!

class-map match-all IPTube

match dscp 2

!

!

policy-map IPTube

class IPTube

priority 2000

!

! 3825

!

interface FastEthernet0/1/0

description ** 2970

switchport mode trunk

!

interface Vlan11

ip address 10.79.11.250 255.255.255.0

service-policy output IPTube

!

class-map match-all IPTube

match dscp 2

!

policy-map IPTube

class IPTube

priority 2000

!

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