[c-nsp] Cisco 7500 High Availability

[Rodney Dunn]

You shouldn't pull an RSP to test it.

Either test crash the RP or do a redundancy force switch-over.

On Mon, Apr 10, 2006 at 05:26:30PM -0400, Eric Kagan wrote:
> >    I've got a customer with some 75xx that have dual RSP4s in them. 
> > We've got identical dram/flash/12.0.32S code on them and I've started 
> > fooling with the high availability stuff. I've received 
> > feedback from a 
> > couple people on NANOG that this doesn't work very well - the four to 
> > eight minute recovery RPR works, but the faster modes do not behave.
> > 
> >   Can anyone comment on this? I'd like to make it go for this 
> > guy, but I 
> > don't want to spend forty hours learning all of the failure 
> > modes for a 
> > software product that works better on other hardware platforms ...
> > 
> > 
> 
> With the IOS and config below we see < 1 min failover (some as low as 15-30
> seconds).  We have had an RSP crash and the other kicks in.  By the time we
> figure out what seems "weird", its already passing traffic.
> 
> One thing I will mention, we had no luck with this in the lab !  If we tried
> to "pull" an RSP to test it, the router would crash and force us to power
> cycle to get it back up.  We just kind of went with it and seems to be ok.
> 
> We usually schedule a maintenance window to reboot it after a crash, but at
> least we are not down in the middle of the day.
> 
> Eric
> 
> 
> c7507#show ver
> Cisco Internetwork Operating System Software
> IOS (tm) RSP Software (RSP-PV-M), Version 12.0(29)S, RELEASE SOFTWARE (fc1)
> System image file is "slot0:rsp-pv-mz.120-29.S.bin"
> cisco RSP4 (R5000) processor with 262144K/2072K bytes of memory.
> Slave in slot 2 is running Cisco Internetwork Operating System Software
> IOS (tm) RSP Software (RSP-PV-M), Version 12.0(29)S, RELEASE SOFTWARE (fc1)
> Slave: Loaded from system
> Slave: cisco RSP4 (R5000) processor with 262144K bytes of memory.
> 
> 
> redundancy
>  no keepalive-enable
>  mode rpr-plus
> hw-module slot 2 image slot0:rsp-pv-mz.120-29.S.bin
> hw-module slot 3 image slot0:rsp-pv-mz.120-29.S.bin
> 
> 
> 
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