From: Zouta oxpf (zouta.oxpf@gmail.com)
Date: Tue Aug 09 2005 - 11:15:18 GMT-3
Hi G,
There is a way to remember this concept:
For INBOUND updates: (Right Formula Prevent Disaster)
Right - Route-Maps
Formula - Filter List
Prevent -Prefix List
Disaster - Distribute List.
For OUTBOUND updates: (Dont Plan Fix Result)
Dont - Distribute-list
Plan - Prefix-list
Fix - Filter list
Result - Route maps
:)
ZO
On 8/9/05, gladston@br.ibm.com <gladston@br.ibm.com> wrote:
> Hi,
>
> This doc is not consistent with the result on C3640-JS-M, Version 12.2(15)T9
>
> ===========================
> The order of preference varies depending on whether the attributes are applied for inbound updates or outbound updates.
> For inbound updates the order of preference is:
>
> 1. route-map
> 2. filter-list
> 3. prefix-list, distribute-list
>
> http://www.cisco.com/warp/public/459/bgpfaq_5816.shtml
>
> =================================
>
> On the following test I expected, based on the doc, that all routes were permitted because of the order of preference higher for route-map.
>
> The result is that route with mask equal or less than 18 are denied.
>
> Config:
>
> router bgp 5
> no synchronization
> neighbor 150.100.2.254 remote-as 254
> neighbor 150.100.2.254 prefix-list Filter-by-prefix-list in
> neighbor 150.100.2.254 route-map Set-LP-Prepend in
>
> All routes are permitted by route-map.
> Prefix with mask equal or less than 18 are denied by prefix-list.
>
>
> Debug:
>
> .Feb 28 21:39:02: BGP(0): 150.100.2.254 rcvd 60.2.128.0/17 -- DENIED due to: distribute/prefix-list;
>
>
>
> More config:
>
> route-map Set-LP-Prepend permit 10
> match ip address 143
> set local-preference 200
> set as-path prepend 254
> !
> route-map Set-LP-Prepend permit 20
> set local-preference 200
> !
> access-list 143 permit ip 154.0.1.0 0.254.0.0 host 255.255.255.0
> !
> ip prefix-list Filter-by-prefix-list seq 5 deny 0.0.0.0/0 le 17
> ip prefix-list Filter-by-prefix-list seq 10 permit 0.0.0.0/0 le 32
>
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