Riverbed SteelHead 3070-SD, User Manual

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70 | Configuring BGP and OSPF Routing Policies on SteelHead SD
What are routing policies?
For example, if you have a SteelHead SD on Branch-1 with eBGP configured on the WAN uplink and
OSPF configured on the LAN zones. The SteelHead SD can distribute LAN routes to the WAN and WAN
routes to the LAN. This method of redistributing routes received via one routing protocol through
another protocol is called
route redistribution or route injection .
Figure 8-1. ASBR deployment in branch 1
SteelHead SD provides:
• BGP redistribution - Support includes static and connected route redistribution, OSPF route
redistribution, and default route redistribution to BGP neighbors.
• OSPF redistribution - Support includes static and connected route redistribution, OSPF route
redistribution, and default route redistribution.
• Extended ASN capability - Extended autonomous system number (ASN) capability is set as the
default when the first AS number is configured. Normal ASN ranges from 1 to 65535, but with the
extended ASN capability the range 65536 to 4294967295 is also supported.
Important: ASBR routing policies are available only on underlay branch networks.
What are routing policies?
Routing polices are rules that are applied when routes are distributed between the routers. Creating
routing policies enables you to redistribute BGP, OSPF, static, and connected routes.
Note: ASBR routing policies are not policy-based routing where routing decisions are made while directing the
traffic.
Creating routing policies enables you to apply certain rules and route attributes while redistributing BGP,
OSPF, static and connected routes. You can create route-maps for the following purposes:
• Route injection in OSPF.
• Default route origination in OSPF.