[f-nsp] Double-switched (looped) traffic on Netiron MLX

Nick Cutting ncutting at edgetg.co.uk
Wed Mar 2 09:00:38 EST 2016

Or better yet, build a network without two gateways on the same LAN. (or set the default gateway to the actual exit point)
Redirects were used to stop extra hops in the broadcast domain.

90 percent of people disable these without knowing why.

-----Original Message-----
From: foundry-nsp [mailto:foundry-nsp-bounces at puck.nether.net] On Behalf Of Franz Georg Köhler
Sent: 02 March 2016 08:39
To: foundry-nsp at puck.nether.net
Subject: Re: [f-nsp] Double-switched (looped) traffic on Netiron MLX

On Tue, Mar 01, 2016 at 08:29:57AM -0700, Josh Galvez wrote:
> I had a similar problem with a VE in a VPLS.  Try this:
> device(config)# no ip icmp redirects
> http://www.brocade.com/content/html/en/configuration-guide/NI_05800a_S
> WITCHING/GUID-04EDFD31-E5FB-4593-8434-0DF8EDB3249E.html


I have already set no ip icmp redirects.

While this is not a default setting, it is generally a good idea to disable icmp redirects because the system would otherwise tend to high CPU utilization as it is analyzing traffic to send icmp redirects (at least if the traffic is leaving on the same interface).
As most systems ignore ICMP redirects anyway, there is no benefit in keeping the default option enabled and I strongly recommend to always disable it.

Best regards,

Franz Georg Köhler

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