- Cable the lab as shown in the
diagram above.
- Fully configure routers B and C in
AS 100 to support the above network. Include all necessary BGP
statements, IGP routing, and advertise the network between B and
C in BGP. AS 100 is going to be running IBGP as well as EBGP.
- Now configure Router A for BGP
connectivity. Advertise network 10.0.0.0.
- Verify that BGP is running
correctly. Do not factor in the 3 requirements for this network.
Simply make sure you have connectivity.
- Outbound traffic should always go
on the primary link. This issue can be addressed by configuring
static routes with different metrics for each link. Since the
primary link is preferred, we will assign it a lower metric. The
commands are as follows:
- RouterA(config)#ip route 0.0.0.0
0.0.0.0 2.2.2.1 30 (Primary Link)
- RouterA(config)#ip route 0.0.0.0
0.0.0.0 1.1.1.1 50 (Backup Link)
Use the trace command to get to
192.68.11.1 from Router A. What route was taken? Are you surprised?
Why did it choose that route?

- The next requirement is
to be sure that all inbound traffic comes in on the primary
link. This can be accomplished by sending different metrics into
AS 100 on both links. This is easily accomplished using a route
map. For simplicity, call the route maps PrimaryMetric and
BackupMetric. The configuration of the route map is quite
simply:
- RouterA(config)#route-map
PrimaryMetric permit 10
- RouterA(config-Route-map)#set
metric 50
- RouterA(config)#route-map
BackupMetric permit 10
- RouterA(config-route-map)#set
metric 100
Why did we set the metric lower on
the primary link?

- Don't forget to apply each route
map to the appropriate neighbor. PrimaryMetric should be applied
to 2.2.2.1. BackupMetric should be applied to 1.1.1.1.
- The last requirement is to prevent
AS 100 from sending updates into AS 200. This can be done with
another route map statement. The route map will be as follows:
RouterA(config)#route-map
BlockUpdates deny 10
Which neighbor(s) should this route
map be applied to?
Should it be applied in or out?

- Verify everything is functioning
as outlined.
Can you ping the 192.68.11.0
network?

- Use the trace command to get to
the 192.68.11.0 network.
What the primary link taken?

Does the backup link work?

Unplug the primary link cable.
Can you still access network
192.68.11.0?

- Reconnect and save your
configuration. Note any issues you have encountered with this
lab.