[c-nsp] Announce network in OSPF according to two or more interface state

[Joe Shen]

Hi,

  is it possible to announce subnet only if two
interfaces is up?

  we got such a situation :

          Outside network 
   
    |         OSPF runs         |
    Cat4503(1) -------------- Cat4503(2)
     |                          |
     |          heatbeat        |
  load balancer-1 -----------  load balancer -2
     |                         |
     |                         |
         Internal network

  the whole network is given a Class C IP address
block, which is announced to outside by OSPF, two 
Cat4503 are used as border routers. 

   As there will be only ONE l4-switch active at any
time, traffic from outside MUST flow through link ( or
trunk) between the two Cat4503s. That is, traffic
could not flow through the other load balancer to
internal network.

   But, when the link (or trunk ) between two Cat4503
is down, two  4503 will keep announcing the same IP
network to outside. But, when traffic arrive at the
catalyst 4503 which just connects to a standby load
balancer, it will be dropped. 

   So, is is possible to configure  Catalyst4503 to
announce IP network only if link between 4503 and link
to Load balancer is active ?

  thanks in advance .


 Joe




		
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