Brocade FastIron Ethernet Switch Layer 3 Routing Configuration Guide - Manual (Page 458)

NOTE
Remember that autonomous system path matching that uses regular expression is based on the
configured autonomous system format.
The following command sequences show how to enable the different notations for AS4s and how
these notations appear in the output display.
To see ASNs in asplain, use the show ip bgp command.
device(config)# show ip bgp
Total number of BGP Routes: 1
Status codes:s suppressed, d damped, h history, * valid, > best, i internal, S stale
Origin codes: i - IGP, e - EGP,? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 47.1.1.0/24 192.168.1.5 1 100 0 90000 100 200 65535 65536 65537
65538 65539 75000 ?
To specify asdot notation before displaying IP BGP4 information, use the as-format command.
device(config)# as-format asdot
device(config)# show ip bgp
Total number of BGP Routes: 1
Status codes: s suppressed, d damped, h history, * valid, > best, i internal, S stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 10.1.1.0/24 192.168.1.5 1 100 0 1.24464 100 200 65535
1.0 1.1 1.2 1.3 1.9464 ?
Syntax: [no] as-format asplain | asdot | asdot+
The default is asplain and can be restored using the no version of the command, if the CLI is currently
using asdot or asdot+ .
To activate asdot+ notation, enter as-format asdot+ in the CLI.
device(config)# as-format asdot+
device(config)# show ip bgp
Total number of BGP Routes: 1
Status codes: s suppressed, d damped, h history, * valid, > best, i internal, S stale
Origin codes: i - IGP, e - EGP,? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 10.1.1.0/24 192.168.1.5 1 100 0 1.24464 0.100 0.200
0.65535 1.0 1.1 1.2 1.3 1.9464 ?
BGP4 AS4 attribute errors
This section describes the handling of the confederation path segments in the AS4_PATH attribute,
and also specifies the error handling for the new attributes.
To support AS4, the following attributes: AS4_PATH and AS4_Aggregator were specified in RFC
4893. Confederation path segments in an AS4_PATH are discarded and if there are any other errors
such as: attribute length , flag , confederation segments after AS_SEQ/AS_SET, Invalid segment
types and More than one AS4_PATH in these new attributes, the attribute is discarded and the error is
logged.
Error logs
The device generates a log when it encounters attribute errors in AS4_PATH and
AS4_AGGREGATOR.
BGP4 AS4 attribute errors
458 FastIron Ethernet Switch Layer 3 Routing Configuration Guide
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