
BayRS Version 15.5.0.0 Document Change Notice
8-8 314470-15.5 Rev 00
In prior implementations of OSPF NSSA, which were based on RFC 1587, Nortel
routers selected as the ASE forwarding address, the lowest IP address of the
interfaces that were up at that time on the router. However, this implementation
sometimes caused convergence problems when the interface with the lowest IP
address went down and the next available interface IP address was used as the
ASE forwarding address.
Using the version 15.5.0.0 functionality, a network administrator now can specify
the IP address to be used as the ASE forwarding address, thus enabling him or her
to specify the IP address of an interface that is known to stay up all the time. To
ensure maximum up time, it is recommended that you use the IP address of the
circuitless IP interface on the router as the ASE forwarding address.
To use this functionality, you must configure two new parameters as described in
the following sections:
• Enabling and Disabling RFC 3101 Forwarding Address Compatibility
• Configuring the Not-So-Stubby Area (NSSA) Forwarding Address
When you start OSPF on the router, RFC 3101 compatibility is disabled by
default. When RFC 3101 compatibility is disabled, any configured ASE
forwarding address is ignored.
Enabling and Disabling RFC 3101 Forwarding Address Compatibility
You can use the BCC or Site Manager to enable and disable RFC 3101
compatibility on the router.
Using the BCC
To enable or disable RFC 3101 compatibility on the router, go to the global OSPF
prompt (for example, box; ip; ospf) and enter:
rfc3101-fwd-addr-compatibility <state>
state
is one of the following:
disable (default)
enable
For example, the following command enables RFC 3101 compatibility on the
router:
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