Riverbed SteelHead 3070-SD, User Manual

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Configuring BGP and OSPF Routing Policies on SteelHead SD | 69
8
Configuring BGP and OSPF Routing
Policies on SteelHead SD
This topic describes how to configure autonomous system boundary routers (ASBR) and route policies.
It includes these sections:
• “Overview of routing policies on SteelHead SD” on page 69
• “What are routing policies?” on page 70
• “Creating routing IPv4 prefix lists” on page 72
• “Creating routing community lists” on page 73
• “Creating routing AS path lists” on page 74
• “Configuring route maps” on page 76
Overview of routing policies on SteelHead SD
SteelHead SD appliances act as a full ASBR when they are located at the branch. ASBR-full routing
policies are supported on SteelHead SD 570-SD, 770-SD, and 3070-SD appliances and the SteelConnect
SDI-2030 gateway located at the branch. ASBR-full support is not available on SteelConnect SDI-130/
330/1030 and virtual gateways.
An ASBR is a router that is connected to several autonomous systems (ASs) using multiple protocols.
Typically, ASBRs are connected via an exterior routing protocol (for example, BGP). An ASBR can also
connect LAN routers through an interior gateway protocol (IGP), such as OSPF within its own AS.
Basically, with an ASBR you are distributing routes from BGP to OSPF and from OSPF to BGP. An ASBR
can also distribute static and connected routes into these protocols.