Brocade Communications Systems FastIron SX 1600, Руководство по настройке, Страница: 304 / 593

Configuring external route summarization
When the Brocade device is an OSPF Autonomous System Boundary Router (ASBR), you can configure it to advertise one external
route as an aggregate for all redistributed routes that are covered by a specified IPv6 address range.
When you configure an address range, the range takes effect immediately. All the imported routes are summarized according to the
configured address range. Imported routes that have already been advertised and that fall within the range are flushed out of the AS and
a single route corresponding to the range is advertised.
If a route that falls within a configured 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 configured 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 flushed.
You can configure 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 flushed and all imported routes that fall within the range are advertised
individually.
If an external link state database overflow (LSDB) condition occurs, all aggregate routes are flushed out of the AS, along with other
external routes. When the device exits the external LSDB overflow condition, all the imported routes are summarized according to the
configured address ranges.
NOTE
If you use redistribution filters in addition to address ranges, the Brocade device applies the redistribution filters to routes first,
then applies them to the address ranges.
NOTE
If you disable redistribution, all the aggregate routes are flushed, along with other imported
routes.
NOTE
This option affects only imported, type 5 external routes. A single type 5 LSA is generated and flooded throughout the AS for
multiple external routes.
To configure 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 prefix 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-prefix / prefix-length }
You must specify the ipv6-prefix parameter in hexadecimal using 16-bit values between colons as documented in RFC 2373.
You must specify the prefix-length parameter as a decimal value. A slash mark (/) must follow the ipv6-prefix parameter and precede the
prefix-length parameter.
Filtering OSPFv3 routes
You can filter the routes to be placed in the OSPFv3 route table by configuring 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.
Configuring OSPFv3
FastIron Ethernet Switch Layer 3 Routing
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