[c-nsp] condition BGP quastion

[Bruce Pinsky]

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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.

- --
=========
bep

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