Avaya Configuring IP, ARP, RARP, RIP, and OSPF Services Instrukcja Użytkownika Strona 195

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Customizing OSPF Services
308627-14.20 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, Nortel 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 to a value in accordance
with RFC 1745, OSPF/BGP Interaction.
In Figure 6-2
, for example, boundary router R14 running OSPF and BGP learns
external routes through BGP. The following steps occur:
1.
Router R14 generates an ASE advertisement describing the route. OSPF fills
in the external route tag with BGP-specific information (origin bits and
previous AS; the rest of the AS path and next-hop attribute are lost) according
to RFC 1745.
2. Router R1, which runs OSPF and BGP, receives the ASE. R1 generates a BGP
update for the network advertised in the ASE, 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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