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Vaibhava Varma

Regarding_QoS_in_REP_Rings_&_MPLS Backbone !

Dear All

Need some pointers regarding the QoS Design for my Customer Network which is Comprised of below elements:


Access-Layer 2 REP Rings:


1. IE3000-

Platform: cisco IE-3000-8TC

Cisco IOS Software, IES Software (IES-LANBASEK9-M), Version 12.2(55)SE5, RELEASE SOFTWARE (fc1)

2. ME3400-

Platform: cisco ME-3400EG-12CS-M

Cisco IOS Software, ME340x Software (ME340x-METROACCESSK9-M), Version 12.2(54)SE, RELEASE SOFTWARE (fc1)


Platform: cisco WS-C4948

Cisco IOS Software, Catalyst 4500 L3 Switch Software (cat4500-ENTSERVICESK9-M), Version 12.2(53)SG5, RELEASE SOFTWARE (fc1)


MPLS Edge-PE//MPLS-Core P:



Platform: Cisco CISCO7609-S

Cisco IOS Software, c7600rsp72043_rp Software (c7600rsp72043_rp-ADVENTERPRISEK9-M), Version 12.2(33)SRE1, RELEASE SOFTWARE (fc2)

Mod Ports Card Type                              Model              Serial No.

--- ----- -------------------------------------- ------------------ -----------

  1   48  CEF720 48 port 10/100/1000mb Ethernet  WS-X6748-GE-TX     SAL13516UGC

  2   48  CEF720 48 port 10/100/1000mb Ethernet  WS-X6748-GE-TX     SAL13516HX6

  5    2  Route Switch Processor 720 (Active)    RSP720-3C-GE       JAE140207EM

Mod MAC addresses                       Hw    Fw           Sw           Status

--- ---------------------------------- ------ ------------ ------------ -------

  1  c47d.4f43.6ec0 to c47d.4f43.6eef   3.4   12.2(18r)S1  12.2(33)SRE1 Ok

  2  c47d.4fc0.c680 to c47d.4fc0.c6af   3.4   12.2(18r)S1  12.2(33)SRE1 Ok

  5  001c.584e.ff58 to 001c.584e.ff5b   5.9   12.2(33r)SRD 12.2(33)SRE1 Ok

Mod  Sub-Module                  Model              Serial       Hw     Status

---- --------------------------- ------------------ ----------- ------- -------

  1  Distributed Forwarding Card WS-F6700-DFC3C     SAL1407B6ZS  1.4    Ok

  2  Distributed Forwarding Card WS-F6700-DFC3C     SAL1407B81S  1.4    Ok

  5  Policy Feature Card 3       7600-PFC3C         JAE1352SHE8  1.2    Ok

  5  C7600 MSFC4 Daughterboard   7600-MSFC4         JAE14020541  1.5    Ok

Now regarding the QoS Design with respect to the various portions of the Network:

1. User can connect on Access Port to either IE3000,ME3400 or C4948.

2. REP Rings are formed via Trunk Uplinks between IE3000 to ME3400 or IE3000 to C4948

3.The L2 REP Rings are being Trunked and Uplinked to MPLS Edge PE-C7609 on Dot1q Sub-Interfaces on WS-6748-GE-TX

4.The MPLS Core-P is connected via L3 Routed Point-to-Point Links on WS-6748-GE-TX.

Now so far I have understood below:

1.IE3000 supports SRR/WTD for CM/CA respectively - Can apply same on both access and trunk ports ?

2. ME3400 Supports CBWFQ/WTD for CM/CA respectively-Can apply same on both access and trunk ports ?

3. C4948 Supports Tx Queue Shaping but for DSCP only.--How will I apply the QoS on the Layer 2 Trunk Links in the REP rings as there is no DSCP but CoS ? I believe on the Trunk Uplink to MPLS PE from C4948 I can do Tx Queue Shaping for CA. CM requires enabling IP routing on Input Policies which is disabled in the network for C4948 . Is there any alternate ?

4. C7600 with PFC3 supports CBWFQ and WRED .I was planning to deploy MPLS Short Pipe Mode for MPLS BB. Can I do CBWFQ with WRED under the same Outbound Policy Map on the Core Links which are comprised of WS-6748-GE-TX or do I need to stick to WRR with WRED on Core Links ?