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4 messages in net.nether.puck.cisco-nsp[c-nsp] condition BGP quastion| From | Sent On | Attachments |
|---|---|---|
| Nikolay Abromov | Jan 27, 2005 10:12 am | |
| Bruce Pinsky | Jan 27, 2005 1:41 pm | |
| Nikolai Abromov | Jan 28, 2005 3:33 am | |
| Bruce Pinsky | Jan 28, 2005 2:01 pm |
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| Subject: | [c-nsp] condition BGP quastion | Actions... |
|---|---|---|
| From: | Nikolai Abromov (nabr...@gmail.com) | |
| Date: | Jan 28, 2005 3:33:52 am | |
| List: | net.nether.puck.cisco-nsp | |
Hi Bruce,
First - thanks for your reply I know about bgp condition , but I'm not quite sure how to setup the rule and there is the problem
uplink1 uplink2 | | [router A] - [router B] | [customer]
and both uplinks are marked with community strings where first uplinks is (xxx:001) the second is (xxx:002), I tried to made when the routes from second uplink disappear then advertise prefix-list which is in route-map "advertize" to uplink1 the configuration is something like this
route-map track-as1111, permit, sequence 10 Match clauses: community (community-list filter): 150 Set clauses: Policy routing matches: 0 packets, 0 bytes
route-map advertize, permit, sequence 10 Match clauses: ip address prefix-lists: advertise-this Set clauses: Policy routing matches: 0 packets, 0 bytes
[..] neighbor 192.168.1.1 advertise-map advertize non-exist-map track-as1111
..
so it's that possible or I do something wrong?
On Thu, 27 Jan 2005 10:41:38 -0800, Bruce Pinsky <bep at whack.org> wrote:
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Nikolay Abromov wrote: | Hello List, | | I have two (bgp) uplink providers which is located on different routers | in local segment and i'm wondering is there any method to make backup of | my customers with advertise-maps with this topology? | | scheme: | | (uplink) (uplink) | | | | [router A] --- [router B] | |
Assuming you mean to only advertise your customer's route via router B to provider #2 only if the connection via router a to ISP #1 fails, then yes you can. That is called conditional BGP advertisement. See
http://www.cisco.com/en/US/tech/tk365/technologies_q_and_a_item09186a00800949e8.shtml#fifteen
and
http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a0080094309.shtml
for more info.
Of course, the other provider must allow you to advertise the customer's route so verify that they have their filters set properly.
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