Re: Lots of prepends - AS20912 case

[Mikael Abrahamsson <swmike () swm pp se>]

On Fri, 20 Feb 2009, Dorn Hetzel wrote:

> Replacing what is conventially thought to be a string with an integer
> multiplier seems a massive violation of the principle of least astonishment.

On a Cisco running 12.0S:

route-map test1
set as-path prepend last-as ?
  <1-10>  number of last-AS prepends

Cisco seems to be doing more sensible limits, but I do agree that the 
feature makes sense.

There are two ways of handling when someone puts in a very high number to 
number of prepends:

1. Say "out of limit" and disallow it in the config checker.
2. Actually prepend the number of times specified.

The option done here:

3. Prepend number of times entered modulo 256, is just broken.

--
Mikael Abrahamsson    email: swmike () swm pp se