[c-nsp] CSM FT failover behavior

[Conaway, Aaron]

We have a pair of CSMs running 4.2(4) in 6509s running 12.2(18)SXF6.
During initial testing, I was able to telnet to port 80 on one of the
RIPs and fail it over, and my telnet session stayed open.  The most loss
I've seen is a few packets, but I've never lost any connections that
were already open.

Of course, your mileage may vary.

-----
Aaron Conaway
 

> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net 
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of James 
> Sneeringer
> Sent: Thursday, August 30, 2007 11:04 AM
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] CSM FT failover behavior
> 
> We have a pair of 6509's running 12.1(27b)E1 native mode, 
> each with a CSM
> running 4.2(6) in FT mode.
> 
> Can anyone comment on the behavior of the CSMs during failover? In the
> section on doing a "hitless upgrade" in the CSM 4.2 
> Configuration Guide[1],
> it's described as not resulting in any "major service 
> interruption", which I
> take to mean that there could still be some noticeable affect 
> of failing
> from one CSM to the other.
> 
> All of our vservers replicate connection and sticky information. Can I
> expect something simple like an HTTP session to survive the failover
> process?
> 
> -James
> 
> [1]
> http://www.cisco.com/en/US/docs/interfaces_modules/services_mo
> dules/csm/4.2.
> x/configuration/guide/redun.html#wp1046227
> 
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