Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 121)

Multi-Service IronWare Routing Configuration Guide 93
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Filtering
The continue command is entered in the context of a route-map instance. The [no] form of the
command deletes the continue clause specified by instance-number. The instance number range
is 0 – 4294967295, and the occurrences of instance-number must be in ascending numeric order.
If you specify a continue clause without an instance number, it means “continue to the next
route-map instance.”
Syntax: [no] neighbor ip-addr | peer-group-name [route-map in | out map-name]
This syntax shows only the neighbor parameters that apply to this example. The ip-addr or
peer-group-name identifies the neighbor, and the [route-map in | out map-name] option lets you
specify a route map and direction to apply to the neighbor.
Dynamic route filter update
Routing protocols use various route filters to control the distribution of routes. Route filters are
used to filter routes received from and advertised to other devices. Protocols also use route-map
policies to control route redistribution from other routing protocols. In addition, route filter policies
are used to select routes to be installed in the routing tables, and used by forwarding engine to
forward traffic.
There are currently 6 different types of route filters defined for use in a device:
• Access List (ACL)
• Prefix-List
• BGP4 as-path Access-list
• BGP4 community-list
• BGP4 extended community-list
• Route-map
Not every protocol uses all of these route filters. A protocol will usually use two or three filter types.
The filters used by BGP4, OSPF, RIP, IS-IS, RIPng, OSPFv3, MSDP, and MCast protocols are
described in
Table 5 .
TABLE 5 Route filters used by each protocol
Protocol Route
map Prefix
list Community- list Extended community- list As-path
access- list ACL
BGP4 X X BGP4 does not use
Community- List filters
directly. It does use them
indirectly through route-map
filters that contain
Community-List filters. BGP4 does not directly use
Extended Community-List
filters, but indirectly uses
them through route-map
filters that contain Extended
Community-List filters. X X
OSPF X X X X X X
RIP X X X X X
IS-IS X X X X X
RIPng X
OSPFv3 X X X X X
MSDP X
MCast X