Checking if both links for Cisco CEF are down?

[d.tom.schmitt at L-3com.com]

Using the 'route:' keyword, is there a way to create dependencies when
you are using a Cisco router with 2 T-1s using Cisco Express Forwarding
(CEF)?

 

I have a remote router that has 2 T-1s balancing using CEF.  Behind this
router are multiple devices that need to not alert if both T-1s are
down.

This would be very similar to have a single T-1 line to the remote site
except I have to be able to group both T-1s together.

 

Can you do something like:

 

                Near end router:    Ethernet port              Local-Eth

                Near end router:    Serial 0 and Serial 1   Local-S0 and
Local-S1

                                To

                Far end router:  Serial 0 and Serial 1 respectively
Remote-Eth

                Far end router:  Ethernet port
Remote-S0 and Remote-S1

                                To 

                Rest of the network at the remote site            e.g.
Remote-Switch

 

Can you group devices together using ()'s?

Something like:

 

                I want Remote-Switch to depend upon both T-1s being
down:

 

                                10.10.10.10   Local-Eth

                                10.10.20.20   Local-S0

                                10.10.20.21   Local-S1

 

                                10.10.20.22   Remote-S0

                                10.10.20.23   Remote-S1

                                10.10.30.30   Remote-Eth

 

                                10.10.30.31   Remote-Switch     #
route:Remote-Eth,(Remote-S0,Remote-S1),Local-Eth

 

                Would this work?

                This says that the Remote-Switch needs to have the
Remote-Eth (Ethernet) connection as a dependency.

                It also needs both T-1s up and the Local-Eth (Ethernet)
connection up.

 

                CEF is a Cisco balancing protocol for multiple same
connections to a remote location.

                If one T-1 is down, the other T-1 will be tasked with
handling all the traffic.

                When the down T-1 returns, it again participates in the
traffic load.

 

Thanks,

 

Tom Schmitt

 

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