Redirect WCCP and Performance hit on 3750

Maybe it's more of a "resizing" qtn more than anything else.

Yesterday, I activated wccp redirect on a stack of distribution has collapsed/3750 of base, in an office with 150users. WAI is model 612.

As soon as the configuration of the redirect has been applied, I found the network slowing significantly and received an event alert CPU of NEM, reports that CPU on 3750 stack exceeds the set threshold (65%). Put the threshold on the one hand, the cli is terribly slow and so I removed immediately redirect to the relevant interfaces. He bought the network back to normal in terms of performance.

Is this a calibration problem or maybe a bad configuration or something else...?


WAE:

EDGE-WAE-01 #show worm
Cisco Wide Area Application Services (WAAS) software
Copyright (c) 1999-2009 by Cisco Systems, Inc.
Cisco Wide Area Application Services Software Release 4.1.3 (build b55 April 18, 2009)
Version: oe612 - 4.1.3.55

00:13:45 compiled April 18, 2009 by cnbuild

System has been restarted on Tue Apr 27 04:30:10 2010.
The system was 6 hours, 21 minutes, 0 seconds.

EDGE-WAE-01 #show inv

PID: WAE-612-K9 VID: 0 SN: KQLLZBL
EDGE-WAE-01 #sh worm
Cisco Wide Area Application Services (WAAS) software
Copyright (c) 1999-2009 by Cisco Systems, Inc.
Cisco Wide Area Application Services Software Release 4.1.3 (build b55 April 18, 2009)
Version: oe612 - 4.1.3.55

00:13:45 compiled April 18, 2009 by cnbuild

System has been restarted on Tue Apr 27 04:30:10 2010.
The system was 6 hours, 31 minutes, 8 seconds.

EDGE-WAE-01 # poster run | WCCP Inc.

WCCP router-list of the 1 10.10.50.1
WCCP promiscuity of tcp router-list-num 1 l2-redirect
WCCP version 2
!
evacuation-method interception-method wccp negotiated return

!

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

3750:

edge-cre-01 #show sdm prefer
The current model is "routing Office" model.
The chosen model optimizes resources in
the switch to sustain this level of features for
8 routed interfaces and 1024 VLANS.

!

processor of WS-C3750G-24TS-1U (PowerPC405) Cisco (revision F0) with K 131072 bytes of memory.

512K bytes of memory simulated by flash not volatile configuration.

SW Version SW Image model switch ports
------ ----- -----              ----------            ----------
* WS-C3750G-24TS-1U 12.2 1 28 (50) SE3 C3750-IPSERVICESK9-M
2 28 WS-C3750G-24TS-1U 12.2 SE3 (50) C3750-IPSERVICESK9-M

Switch 02
---------------

Switch availability: 3 days, 4 hours, 39 minutes

Configuration register is 0xF

edge-cre-01 # poster run | WCCP Inc.
61 TN-WAAS-OUT list redirect IP WCCP
62 TN-WAAS-IN redirect-list IP WCCP

!

edge-cre-01 #show run | start the standard TN-WAAS-OUT ip access list

Standard TN-WAAS-OUT of access list IP
10.10.10.0 permit 0.0.1.255
permit 10.10.25.0 0.0.0.255
!
TN-WAAS-IN extended IP access list
permit tcp 10.20.0.0 0.1.255.255 10.10.10.0 0.0.1.255
permit tcp 10.20.0.0 0.1.255.255 10.10.25.0 0.0.0.255
permit tcp 10.128.16.0 0.0.0.255 10.10.10.0 0.0.1.255

Here is a list of best practices to follow to do forwarding of wccp on hardware platforms such as the 3750.  I found it in the link below.

http://www.Cisco.com/Web/services/news/ts_newsletter/tech/ChalkTalk/archives/200806.html

The following best practices should be applied to the implementation of WCCP on a hardware platform:

  • L2 transfer
  • Assignment of mask
  • Interception of incoming traffic
  • No ' exclude ip wccp redirect in.

Your configuration "output method negotiated return of interception-method wccp" will appeal to a WCCP GRE tunnel to create of the 3750 to CAI.  All traffic will be then be redirected a software based on this configuration line.

"Game of negotiated return as the method of evacuation. With this specification, the Cisco WAE uses GRE to return traffic redirected to the router intercepting. Note: in this case, WCCP negotiated WCCP GRE return method. »

Found here: https://www.cisco.com/en/US/prod/collateral/contnetw/ps5680/ps6870/prod_white_paper0900aecd806d976a_ps6474_Products_White_Paper.html

I'd stick to best practices that Zach has described in the link at the beginning of this post.  It's a very well written on the WCCP redirect article.

Concerning

Tags: Cisco DataCenter

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