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New Member

'bgp bestpath as-path ignore' in ASR 1006

Hi all,

I want to configure BGP to ignore as-path for best path selection in  ASR 1006 router . But in BGP configuration mode, It is not listing as-path option. It is showing as unrecognized command.

RTR1(config-router)#bgp bestpath ?

  compare-routerid  Compare router-id for identical EBGP paths

  cost-community    cost community

  igp-metric        igp metric

  med               MED attribute

  prefix-validate   Prefix origin validation

RTR1(config-router)#

IOS version details are as follows:

RTR1#sh ver

Cisco IOS Software, IOS-XE Software (X86_64_LINUX_IOSD-ADVENTERPRISEK9-M), Version 15.2(4)

S, RELEASE SOFTWARE (fc4)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2012 by Cisco Systems, Inc.

Compiled Mon 23-Jul-12 20:02 by mcpre

IOS XE Version: 03.07.00.S

Cisco IOS-XE software, Copyright (c) 2005-2012 by cisco Systems, Inc.

All rights reserved.  Certain components of Cisco IOS-XE software are

licensed under the GNU General Public License ("GPL") Version 2.0.  The

software code licensed under GPL Version 2.0 is free software that comes

with ABSOLUTELY NO WARRANTY.  You can redistribute and/or modify such

GPL code under the terms of GPL Version 2.0.  For more details, see the

documentation or "License Notice" file accompanying the IOS-XE software,

or the applicable URL provided on the flyer accompanying the IOS-XE

software.

ROM: IOS-XE ROMMON

RTR1 uptime is 31 weeks, 17 hours, 51 minutes

Uptime for this control processor is 31 weeks, 17 hours, 53 minutes

System returned to ROM by reload

System restarted at 23:29:29 IST Sat Apr 6 2013

System image file is "bootflash:/asr1000rp2-adventerprisek9.03.07.00.S.152-4.S.bin"

Last reload reason: PowerOn

Any help would be much appreciated.

Thanks all in advance

Everyone's tags (3)
1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

Re: 'bgp bestpath as-path ignore' in ASR 1006

Irfan,

The command may be hidden but perhaps it can be accepted if you type it in in its entirety. See here, this is a 2691 12.4(15)T13 IOS:

R1(config)#router bgp 1

R1(config-router)#bgp bestpath ?

  compare-routerid  Compare router-id for identical EBGP paths

  cost-community    cost community

  med               MED attribute

R1(config-router)#bgp bestpath as-path ?

% Unrecognized command

R1(config-router)#bgp bestpath as-path ignore ?

% Unrecognized command

R1(config-router)#bgp bestpath as-path ignore

R1(config-router)#do show run | sec router bgp

router bgp 1

no synchronization

bgp log-neighbor-changes

bgp bestpath as-path ignore

no auto-summary

Best regards,

Peter

3 REPLIES
Cisco Employee

Re: 'bgp bestpath as-path ignore' in ASR 1006

Irfan,

The command may be hidden but perhaps it can be accepted if you type it in in its entirety. See here, this is a 2691 12.4(15)T13 IOS:

R1(config)#router bgp 1

R1(config-router)#bgp bestpath ?

  compare-routerid  Compare router-id for identical EBGP paths

  cost-community    cost community

  med               MED attribute

R1(config-router)#bgp bestpath as-path ?

% Unrecognized command

R1(config-router)#bgp bestpath as-path ignore ?

% Unrecognized command

R1(config-router)#bgp bestpath as-path ignore

R1(config-router)#do show run | sec router bgp

router bgp 1

no synchronization

bgp log-neighbor-changes

bgp bestpath as-path ignore

no auto-summary

Best regards,

Peter

New Member

'bgp bestpath as-path ignore' in ASR 1006

Thanks Peter.

That command was hidden. It works now.

But why was that commands hidden ?

Irfan

Cisco Employee

'bgp bestpath as-path ignore' in ASR 1006

Irfan,

My personal opinion: Some commands may be hidden in the IOS if their use is generally discouraged and not meant to be used by common customers but only by TAC engineers to circumvent certain problems or modify a protocol's operation in a way that can make its behavior strongly divergent from the standard. No one is going to take any responsibility for what happens if you use hidden or undocumented commands - and that is why Cisco does not want them to be generally known. It is for both our and Cisco's protection.

There are numerous lists of undocumented IOS commands, e.g.:

http://willy.boerland.com/myblog/book/print/199

http://willy.boerland.com/myblog/the_undocumented_commands

You could certainly use Google to find other similar lists.

Best regards,

Peter

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