04-15-2008 12:00 AM - edited 03-05-2019 10:23 PM
Hi all, suppose i have 10 neighbours configured in bgp process of RA, now i want to advertise network 25.0.0.0/8 to only neighbour 12.0.0.1 in the same AS, i want to do it using the minimal set of commands, how can i do that ?? i dont want to advertise 12.0.0.0 to other neighbours except 12.0.0.1 ok
Thanks
04-15-2008 12:10 AM
Hi,
Its possible to achieve what you have mentioned.The method is called "conditional advertisements" & is implemented with the use of advertise-maps.
Pls refer link for configuration help:
http://www.ciscopress.com/articles/article.asp?p=169556&seqNum=2
04-15-2008 12:14 AM
hi narayan, what i actually want is to tell the bgp process to advertise a particular prefix to a particular neighbour only, in case of conditional advertisement can you provide the configuration of my case ??,
Thanks
04-15-2008 12:30 AM
Hi Ovais,
You need to do prefix filtering using prefix-list or route-map, for simplicity you can use a prefix-list that filters the undesired prefixes while permitting any other prefix.
The prefix-list entry that permits any prefix is:
ip prefix-list FILTER permit 0.0.0.0/0 le 32
Apply the prefix-list to the neighbor:
neighbor x.x.x.x prefix-list FILTER out
BR,
Mohammed Mahmoud.
04-15-2008 12:44 AM
Hi Mohammad, you mean to say that i want to deny prefix 12.0.0.0/8 to my 9 neighbours so i need to apply prefix-list out to 9 neighbours right ??
Now kindly try to get my point is that i want to define some condition on the network itself to be advertised to a specific neighbour !!
04-15-2008 01:10 AM
Hi,
Ok, the only thing that comes to my mind right now is using peer group to group the 9 neighbors, but there is a trick here, you can't define a specific outbound routing policy to a single peer-group member, outbound routing policies can only be applied to the whole peer-group.
BR,
Mohammed Mahmoud.
04-15-2008 01:51 AM
hi Mohammad, i didnt noticed you were a CCIE, well i guess then what you are suggesting is perhaps the only option left, i need to ask something regarding the CCIE lab itself, what i know is that by the end of lab there should be full reachability, but we may be required to perform some filtering in which case a router may not have certain routes in Routing table so how come full reachability can be achieved ??
04-15-2008 02:08 AM
Hi,
Yes, perhaps :) As for the full reachability in the CCIE lab, this excludes any route that was explicitly required to be filtered on a specific router(s), double checking with the proctor in such case is your best option.
BR,
Mohammed Mahmoud.
04-15-2008 02:21 AM
Mohammad can you also tell me that how much qos comes from a switching point of view ?, i mean to say how much area is covered by 3550/3560 switches in the lab ??
Thanks this is my last question :)
04-15-2008 03:23 AM
Hi,
You are very welcomed :) Actually this is a question that i can't answer in details, because of 2 aspects, first this was never declared by Cisco anywhere, secondly according to the NDA i can't inform you with my exam details. But frankly speaking baring in mind the massive points that needs to be covered in the exam, i guess Catalyst QoS if covered won't be a big part.
For more details, the below link is a wonderful link about CCIE Catalyst QoS:
http://classroom.internetworkexpert.com/p95576427
BR,
Mohammed Mahmoud.
04-15-2008 07:40 PM
Is it covering everything regarding catalyst QoS ??
04-16-2008 02:51 AM
Hi,
No, but beside the CoD and Cisco DocCD and your lab you'll find your way.
BR,
Mohammed Mahmoud.
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