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HP 1920 does not turn on ICMP redirect

 
ewgenik
Occasional Collector

HP 1920 does not turn on ICMP redirect

HP 1920 does not turn on ICMP redirect

I enter in the CLI "ip redirects enable" - "Error: The operation is not supported."

I tried on 1920-24G and 1920-8G

Syntax okay -

[HP 1920G Switch]ip redirects ?
  enable  Enable the function

What's the trouble?

 

1 REPLY
16again
Respected Contributor

Re: HP 1920 does not turn on ICMP redirect

Officially, CLI is not supported.  You're lucky when functions present in CLI but not in data sheet work....like RIP and OSPF

But do you really really need redirect?
-Sending a redirect packet costs switch CPU,  just routing to correct gateway is done in switch hardware at wire speed.
-Some hosts don't like redirect and keep sending traffic to wrong gateway. This might overwhelm HP1920 with huge amount of redirects to send.
-redirect is for /32 routes only.  For each new destination IP , a redirect needs to be sent, adding a /32 route to host route table
-What's the gain for redirected host directly connected to 1920?  With redirect, the switch will switch, without redirect, the switch will route at same speed. There's no shorter path.