[c-nsp] PBR on sup720

Sun Nov 4 22:02:01 EST 2012

Basically, any 7600/6500 with Sup720 would be able to do PBR in hardware as long as you follow the feature restrictions (see links below).
Older releases may have older issues, but the more recent software versions should be fine.

The below issue that was fixed in SRD for 7600 was fixed in SXI for 6500.

Arie

From: Xu Hu [mailto:jstuxuhu0816 at gmail.com]
Sent: Sunday, November 04, 2012 00:55
To: Arie Vayner (avayner)
Cc: cisco-nsp at puck.nether.net; Paul Magee
Subject: Re: [c-nsp] PBR on sup720

Hi Arie, i heard there should depend on which ios version and which kind of configirations u use will impact the action about hw or software switching.
On Nov 1, 2012 12:56 AM, "Arie Vayner (avayner)" <avayner at cisco.com<mailto:avayner at cisco.com>> wrote:
Yes, same concept.
Better run on SXI or later to avoid issues with punting to the RP if the next-hop is down...

Another option is to use something like that:

track 1 interface GigabitEthernet3/1 line-protocol
 delay up 15
!
track 2 interface GigabitEthernet3/2 line-protocol
 delay up 15
!
route-map test2 permit 10
 match ip address 100
 set ip next-hop verify-availability 10.2.3.3 10 track 1
 set ip next-hop verify-availability 10.2.2.3 20 track 2

Arie

-----Original Message-----
From: Paul Magee [mailto:pmagee at williamhill.co.uk<mailto:pmagee at williamhill.co.uk>]
Sent: Wednesday, October 31, 2012 09:13
To: Arie Vayner (avayner)
Cc: cisco-nsp at puck.nether.net<mailto:cisco-nsp at puck.nether.net>
Subject: RE: PBR on sup720

Hi Arie,

Does this also apply to the SX version?

Thanks,

Paul

-----Original Message-----
From: Arie Vayner (avayner) [mailto:avayner at cisco.com<mailto:avayner at cisco.com>]
Sent: 31 October 2012 15:59
To: Paul Magee; cisco-nsp at puck.nether.net<mailto:cisco-nsp at puck.nether.net>
Subject: RE: PBR on sup720

Paul,

Nop... All packets are handled in HW assuming your actions are supported...
Performance should be the same as regular routing as long as it's done in HW and you do not exceed TCAM resources.

In some older IOS versions there were issues with what happens when the next hop is not available... Packets were punted to the RP. This is not the case after SRD (I think).

Check out:
http://www.cisco.com/en/US/partner/docs/routers/7600/ios/12.2SR/configuration/guide/cef.html
http://www.cisco.com/en/US/partner/docs/routers/7600/ios/12.2SR/configuration/guide/layer3.html#wp1027016

Arie

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net<mailto:cisco-nsp-bounces at puck.nether.net> [mailto:cisco-nsp-bounces at puck.nether.net<mailto:cisco-nsp-bounces at puck.nether.net>] On Behalf Of Paul Magee
Sent: Wednesday, October 31, 2012 08:40
To: cisco-nsp at puck.nether.net<mailto:cisco-nsp at puck.nether.net>
Subject: [c-nsp] PBR on sup720

Hello,

Does anyone have any experience of using policy based routing with vrf-lite on a Sup 720?

I gather that the first packet is handled in software and from that point on the route exists in the cef table. Is that a big performance hit? What sort of throughput/number of connections can I expect to be able to handle before everything comes crashing to its knees? Do Cisco have any figures on this hidden away anywhere?

Thanks,

Paul

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