
Configuring IP Services
7-18
303528-A Rev 00
Choosing a Tag Generation Method for an ASE Advertisement
An OSPF AS external route advertisement includes an external route tag field.
This field allows boundary routers in an AS to exchange information about
external routes. (The specific nature of this information is outside the scope of
OSPF.)
By default, Bay Networks boundary routers that generate ASEs set the external
route tag field to 0. For a boundary router running OSPF and BGP, you can
configure OSPF to set the external route tag field with a value in accordance with
RFC 1403, OSPF/BGP Interaction.
In Figure 7-3
, for example, boundary router R14 running OSPF and BGP learns
external routes via BGP:
1. Router R14 generates an ASE describing the route. OSPF fills in the external
route tag with BGP-specific information according to RFC 1403.
2. Router R14 injects the ASE into the AS, and OSPF routers flood the ASE
throughout the AS.
3. Router R1, which runs OSPF and BGP, receives the ASE. R1 generates a BGP
update, using the contents of the external route tag to set the Origin and AS
Path attributes in the update.
Note:
This parameter applies to boundary routers only.
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