[c-nsp] WCCPv2 Cisco 7600 + mask assignment problems

[Steven Wilton]

Mark,

We are using 12.2SXF.  If I get squid to try and negotiate L2 + HASH, the router returns an I_SEE_YOU packet with the L2 + MASK capabilities set (ie the router seems to force L2 + MASK together).

You're right that squid does not currently supprt the MASK assignment type - I'm currenty trying to implement this.  There's some differences between the way L2 + MASK and GRE + HASH assignments are negotiated, which I don't fully understand.  Lincoln  is helping me sort through the problems I'm seeing, and we will hopefully get MASK assignments working in squid.

I've taken the discussion with Lincoln off-list because I'm sending packet dumps.

Steven

> -----Original Message-----
> From: Mark Pace Balzan [mailto:mpb at melitacable.com] 
> Sent: Monday, 11 September 2006 1:35 PM
> To: cisco-nsp at puck.nether.net
> Cc: Steven Wilton
> Subject: Re: [c-nsp] WCCPv2 Cisco 7600 + mask assignment problems
> 
> 
> Steven,
> 
> My 0.02...
> 
> As far as I know C7600 will support various combinations of L2/GRE
> forwarding and hash/mask assignment for WCCP v2. I assume you are
> running 12.2SXF?  WCCP is negotiated between 7600 and your 
> squid.  So if
> squid doesn't support MASK (afaik it does not, but may be wrong), then
> 7600 will fallback to HASH. Same for L2/GRE.  Note that on 7600, the
> L2/MASK combination is supported fully in hardware in the PFC, while
> other combinations result in various levels of software forwarding via
> the MSFC, which is when you need to keep a watch on the CPU 
> of your 7600
> 
> 
> Hope this helps
> 
> 
> M
> 
> 
> ------------------------------------------------
> 
> Date: Mon, 11 Sep 2006 09:46:15 +0800
> From: "Steven Wilton" <steven.wilton at team.eftel.com.au>
> Subject: [c-nsp] WCCPv2 Cisco 7600 + mask assignment problems
> To: <cisco-nsp at puck.nether.net>
> Message-ID:
> 	
> <F26CB22B0C062148955B0FEB2660234032DD81 at exch-perth.corporate.e
> ftel.com>
> 	
> Content-Type: text/plain;	charset="windows-1250"
> 
> I've seen some posts on this list regarding getting wccpv2 
> working with
> a cisco 7600 using L2 redirect assignment.  I'm trying to get this
> working under squid, and I believe I've got it correct 
> according to the
> draft wccp2 RFC that was published around 2000/2001.  My 
> problem is that
> the cisco router reports the following error while the WCCP 
> negotiation
> is ocurring:
> 
> 3d21h: WCCP-EVNT:wccp_validate_wc_assignments: no mask data, exit
> 
> The problem is that this is in response to a HERE_I_AM packet.
> 
> Has anyone got a working wccp2 implementation that negotiates L2
> redirects and mask assignments that I can use as a reference 
> for squid?
> The other option for me would be to get a packet dump of the wccp2
> negotiation packets so I can look at what parts of the packet I'm
> missing.
> 
> Regards
> 
> Steven Wilton
> 
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