Riverbed SteelHead 3070-SD, User Manual

Page: 50 / 124

50 | Configuring BGP, OSPF, Static Routing, and Route Retraction on SteelHead SD
Configuring BGP on SteelHead SD
• Incomplete - The routes that are redistributed into BGP from other protocols. The prefix originates
from an aggregate statement or via redistribution of a static route.
The lowest origin type is the preferred path: IGP is lower than EGP, and EGP is lower than Incomplete.
Only the routes with the lowest origin value are considered when multiple routes share the shortest AS
path, then the algorithm continues by considering the multi exit discriminator (MED) settings. For details,
see
“Enabling multi exit discriminator (MED) settings” on page 51 and “Configuring BGP path selection”
on page 45 .
You set the origin type when you create a route-map that has the use case: Policies at the BGP neighbor
level use case. Enabling the origin-type attribute in a BGP route map enables you to filter the routes or
change the origin type of routes received from a BGP neighbor. For details, see
“Configuring BGP path
selection” on page 45 .
Tip: You can also set the origin-type attribute in use case: User defined route map. This use case enables you to
define a route map using any of the match and set criteria that are available in all the route-map use cases. For details
on route maps and use cases, see
“Configuring route maps” on page 76 .
To create a route map with the origin-type attribute
1. Choose Routing > Route Map.
2. Click Add Route Map .
3. Specify a name for the route map. Make sure you use a descriptive name to help you differentiate
this route map.
4. Select the use case: Default route origination in BGP for a neighbor.
5. Click Submit .
6. Select the new policy to expand the page.
Figure 7-4. Configuring the origin-type attribute