Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 62)

34 Multi-Service IronWare Routing Configuration Guide
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BGP4 AS4 attribute errors
To specify asdot notation before displaying IP BGP4 information, use the as-format command.
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.
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.
NOTE
Logging of errors is rate-limited to not more than one message for every two minutes. Some errors
may be lost due to this rate-limiting.
Sample log messages for various attribute errors are shown here.
Attribute length error (ignore the AS4_PATH)
SYSLOG: Sep 9 19:02:03:<11>mu2, BGP: From Peer 192.168.1.1 received invalid
AS4_PATH attribute length (3) - entire AS4_PATH ignored
Brocade(config)# as-format asdot
Brocade(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 ?
Brocade(config)# as-format asdot+
Brocade(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 ?