[nsp] IPinIP Tunnel termination on Cat4500

[Church, Chuck]

Have you tried GRE?  Cisco seems to prefer the use of that over IPinIP.  Perhaps their GRE code is more efficient than the IPinIP code.  I've heard the sup 3 and 4 do GRE pretty well, but haven't tried it personally.  As far as the OSPF adjacency problem, it's probably just due to packet loss.  Are there 'too many retransmission' messages in the logs or debugs?

Chuck Church
CCIE #8776, MCNE, MCSE
Wam!Net Government Services
13665 Dulles Technology Dr. Ste 250
Herndon, VA 20171
Office: 703-480-2569
Cell: 703-819-3495
cchurch at wamnetgov.com
PGP key: http://pgp.mit.edu:11371/pks/lookup?op=index&search=cchurch%40wamnetgov.com

> -----Original Message-----
> From: RANGARIRAYI MUVAVARIRWA [mailto:muvavarirwa at msn.com]
> Sent: Saturday, January 24, 2004 10:19 AM
> To: cisco-nsp at puck.nether.net
> Subject: [nsp] IPinIP Tunnel termination on Cat4500
> 
> 
> An IPinIP tunnel is implemented across two catalyst switches 
> as follows:
> 
> 1. 	Cat4500_VLAN400 <==> IPinIP <==> Cat3500_VLAN400
> 2. 	OSPFv2 across tunnel interface
> 
> The following behavior is observed:
> 
> 3. 	Failure to complete FULL OSPF adjacency
> 3.1	Cat3500 side goes into INIT state
> 3.2 	Cat4500 side goes into NULL state (-)
> 
> 4.	Input queue drops observed Tunnel_Interface_Cat4500
> 
> ACTION
> 
> 5. 	Increased HOLD-QUEUE IN on Tunnel_Interface_Cat4500 to 
> match value on 
> corresponding Physical Interface (2000)
> 
> 
> RESULT
> 
> 6.	OSPF Adjacency came back
> 
> ISSUE
> When we 'stress' tested this link, SUPRISINGLY packet drops and OSPF 
> adjacency loss returned when sending more than 40kbps...this 
> is too low a 
> threshold a Cat4500.
> 
> QUESTION
> Does the cat4500 significantly de-prioritize Tunnel (IPinIP 
> in this case) 
> processing compared physical interfaces? i.e does the cat4500 
> process switch 
> IPinIP traffic? Conversely, is there a way to improve IPinIP traffic 
> processing on Cat4500?
> 
> Note: Cat4500 is running 12.1(13)EW
> 
> 
> regards,
> 
> Ranga Muvavarirwa
> 
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