10-06-2008 08:29 AM - edited 03-06-2019 01:47 AM
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.
10-10-2008 01:24 PM
Please verify your interfaces towards IPTube2 and 3825 using command
show mls qos interface.
Verify your DSCP marking also.
Verify your VLAN port configuration between 1811-3825 have some problem.
10-16-2008 05:55 AM
The interfaces are fine. The 3825 sees DSCP from IPTube1 and sends it off towards the 1811 where it can be seen heading towards IPTube2. The 1811 sees DSCP from IPTube2 heading towards the 3825 and appears to be sending it towards the 3825, but the 3825 isn't seeing it.
Since it works one way and not the other, I don't think it's a VLAN issue between the 1811 and the 3825.
10-10-2008 05:05 PM
the first thing is on the switchport level u need to trust COS or DSCP based on ur device
the same thing on the uplink port to other switch along the way to get end-toend qos marking
if helpful Rate
10-16-2008 05:52 AM
The ports on the switches are fine. If they weren't, I wouldn't be able to see DSCP on either router, which I do. The problem is the 3825 isn't seeing the DSCP markings from IPTube2, but the 1811 does see the DSCP markings from IPTube2, so something is blocking them between the 1811 and the 3825 (but the 1811 can see DSCP markings from IPTube1 via the 3825 in the other direction, no problem).
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