Summary and Default Route

  

Summary and Default Route

•  Summarizing routes reduces the size of the routing table.

•  Route summarization is the process of combining a number of static routes into a single static route.

Configuring a summary route

1. Step 1: Delete the current static route
2. Step 2: Configure the summary static route
3. Step 3: Verify the new static route

Default Static Route

•  This is a route that will match all packets. Stub routers that have a number of static routes all exiting the same interface are good candidates for a default route.

-Like route summarization this will help reduce the size of the routing table

Configuring a default static route

• Similar to configuring a static route. Except that destination IP address and subnet mask are all zeros

• Example: -Router(config)#ip route 0.0.0.0 0.0.0.0 [exit-interface | ipaddress]

Static routes and subnet masks

The routing table lookup process will use the most specific
match when comparing destination IP address and subnet
mask

Default static routes and subnet masks

Since the subnet mask used on a default static route is 0.0.0.0
all packets will match.