[c-nsp] why disable ip cache and direct broadcast in switch

[Max Palatnik]

No ip-route cache with no keywords afterwards refers to the fast-switch
handling of packets.  CEF is usually enabled globally on the device (and
thus is enabled for each interface), so this forces the interface to use CEF
and ensures fast-switching is not enabled on the port.

More info: 
http://www.cisco.com/en/US/docs/ios/12_3/switch/command/reference/swi_i1.htm
l#wp1110844


On 2/25/09 6:42 PM, "Steve Bertrand" <steve at ibctech.ca> wrote:

> Jay Hennigan wrote:
>> ann kok wrote:
> 
>>>  no ip route-cache
>> 
>> This is generally NOT a good thing, other than for debugging during
>> low-traffic scenarios.  It forces traffic to be process-switched and
>> will cause high (or very high) router CPU utilization.
> 
> ...I had a misunderstanding about this then... I thought "no ip
> route-cache" forced traffic to use cef where possible. Almost makes
> sense that route-cache == cef :)
> 
> I've only seen the "no ip route-cache" in practise once. It was years
> ago on a 3620 router on a PtP serial T1 link to MCI.
> 
> Steve
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