Cisco uRPF failures

Tom Zingale (tomz) tomz at cisco.com
Mon Sep 15 11:31:39 CDT 2008


The 3560E/3750E support uRPF as per docs:
http://www.cisco.com/en/US/docs/switches/lan/catalyst3750e_3560e/softwar
e/release/12.2_46_se/configuration/guide/swiprout.html#wp1388196

The unsupported command guide looks in error.

> -----Original Message-----
> From: Brandon Ewing [mailto:nicotine at warningg.com]
> Sent: Saturday, September 13, 2008 11:26 AM
> To: nanog at nanog.org; saku+nanog at ytti.fi
> Subject: Re: Cisco uRPF failures
> 
> On Thu, Sep 11, 2008 at 08:11:28PM +0300, Saku Ytti wrote:
> >
> > Sound like these shops are using 3550 as router, which is common for
> > smaller shops, especially in EU. And indeed, 3550 would not do uRPF.
> > (3560E does).
> >
> 
> Are you sure?  According to the IOS guide for 3560E/3750E, "ip verify"
> is
> still an unsupported interface command.  I don't have a 3560E handy to
> test
> on, but I know that a non-E 3560 refuses it with a notice regarding
how
> verification is not supported by hardware.
> 
> http://tinyurl.com/5qbqzb
> 
> --
> Brandon





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