Conguring external route summarization
When the Brocade device is an OSPF Autonomous System Boundary Router (ASBR), you can congure it to advertise one external
route as an aggregate for all redistributed routes that are covered by a specied IPv6 address range.
When you congure an address range, the range takes eect immediately. All the imported routes are summarized according to the
congured address range. Imported routes that have already been advertised and that fall within the range are ushed out of the AS and
a single route corresponding to the range is advertised.
If a route that falls within a congured address range is imported by the device, no action is taken if the device has already advertised the
aggregate route; otherwise, the device advertises the aggregate route. If an imported route that falls within a congured address range is
removed by the device, no action is taken if there are other imported routes that fall with in the same address range; otherwise the
aggregate route is ushed.
You can congure up to 32 address ranges. The device sets the forwarding address of the aggregate route to zero and sets the tag to
zero.
If you delete an address range, the advertised aggregate route is ushed and all imported routes that fall within the range are advertised
individually.
If an external link state database overow (LSDB) condition occurs, all aggregate routes are ushed out of the AS, along with other
external routes. When the device exits the external LSDB overow condition, all the imported routes are summarized according to the
congured address ranges.
NOTE
If you use redistribution lters in addition to address ranges, the Brocade device applies the redistribution lters to routes rst,
then applies them to the address ranges.
NOTE
If you disable redistribution, all the aggregate routes are ushed, along with other imported
routes.
NOTE
This option aects only imported, type 5 external routes. A single type 5 LSA is generated and ooded throughout the AS for
multiple external routes.
To congure the summary address 2001:db8::/24 for routes redistributed into OSPFv3, enter the following command.
device(config-ospf6-router)# summary-address 2001:db8::/24
In this example, the summary prex 2001:db8::/24 includes addresses 2001:db8::/1 through 2001:db8::/24. Only the address
FEC0::/24 is advertised in an external link-state advertisement.
Syntax: summary-address { ipv6-prex/prex-length}
You must specify the ipv6-prex parameter in hexadecimal using 16-bit values between colons as documented in RFC 2373.
You must specify the prex-length parameter as a decimal value. A slash mark (/) must follow the ipv6-prex parameter and precede the
prex-length parameter.
Filtering OSPFv3 routes
You can lter the routes to be placed in the OSPFv3 route table by conguring distribution lists. OSPFv3 distribution lists can be applied
globally or to an interface.
The functionality of OSPFv3 distribution lists is similar to that of OSPFv2 distribution lists.
Conguring OSPFv3
FastIron Ethernet Switch Layer 3 Routing
304 53-1003627-04
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