Avaya Configuring IP, ARP, RIP, and OSPF Services Instrukcja Użytkownika Pobierz pdf (Strona 181)

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Customizing OSPF Services

117356-E Rev 00

6-11

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 ASE advertisements 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 6-2

, for example, boundary router R14 running OSPF and BGP learns

external routes via BGP:

1. Router R14 generates an ASE advertisement 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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