[c-nsp] 3825 sending DSCP in one direction, but not the other.

[Jason Lixfeld]

The topology: (hopefully my ASCII drawing formats correctly)
-------------

[IPTube1]-<vlan11>-[2970]-<vlan11>-[3825]-<vlan42>-[1811]-<vlan31>- 
[IPTube2]

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:
------------
The 3825 either isn't receiving DSCP 2 from IPTube2 or isn't sending  
DSCP 2 from IPTube 2 on to IPTube 1:

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



In the other direction, everything is fine.  The 1811 is seeing DSCP 2  
from IPTube 1 all the way through the network without a 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



Anyone see anything fishy in the configs or in the software versions  
that might explain this?  Only the non-working bits are included  
below, but in both the working and non-working cases, the same class- 
map and policy-map are used.



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
!

Thanks in advance for any insight folks.