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New Member

Route Distinguisher 0:0 !!!

Hello,

Has anyone seen "Route Distinguisher 0:0"?

I have a setup simulating an Inter-AS L3VPN - Back to Back VRF

configuration.

The problem is that in one of the VRFs, under command "show ip bgp vpnv4

vrf VRF_TEST" I see usual routes under the RD configured for the said

VRF alongwith with another RD 0:0 - which is not configured. There is

another router (redundant) with the same configuration (HSRP), this

router does not show RD 0:0.

Any idea why this irritant? I haven't observed any impact on forwarding

yet.

Thanks

~sultan

9 REPLIES
New Member

Re: Route Distinguisher 0:0 !!!

Sultan,

I've also tried to configure this rd 0:0 Looks intersting to me :)

PE1>en

Password:

PE1#conf t

Enter configuration commands, one per line. End with CNTL/Z.

PE1(config)#ip vrf test

PE1(config-vrf)#rd ?

ASN:nn or IP-address:nn VPN Route Distinguisher

PE1(config-vrf)#rd 0:0 ?

PE1(config-vrf)#rd 0:0

PE1(config-vrf)#route-target both 0:0

PE1(config-vrf)#^Z

PE1#sh run

!

ip vrf test

rd 0:0

route-target export 0:0

route-target import 0:0

!

Same as well on PE2 routers.

PE2#sh ip bgp vpn vrf test

BGP table version is 13, local router ID is 192.168.190.128

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

r RIB-failure, S Stale

Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path

Route Distinguisher: 0:0 (default for vrf test)

*>i1.1.1.1/32 192.168.190.48 0 100 0 ?

*> 2.2.2.2/32 0.0.0.0 0 32768 ?

PE2#sh mpls for vrf test

Local Outgoing Prefix Bytes tag Outgoing Next Hop

tag tag or VC or Tunnel Id switched interface

21 Aggregate 2.2.2.2/32[V] 0

PE2#sh ip bgp vpn vrf test 1.1.1.1

BGP routing table entry for 0:0:1.1.1.1/32, version 11

Paths: (1 available, best #1, table test)

Flag: 0x820

Not advertised to any peer

Local

192.168.190.48 (metric 3) from 192.168.190.48 (192.168.190.48)

Origin incomplete, metric 0, localpref 100, valid, internal, best

Extended Community: RT:0:0,

mpls labels in/out nolabel/21

cheers.

maher

New Member

Re: Route Distinguisher 0:0 !!!

Hello Maher,

First up thanks for replying..

The 'interesting' part is compounded by the fact that I haven't configured this RD 0:0.

I just have a couple of VRFs, and this RD 0:0, just suddenly popped up after a few days, dunno how and why...

It is not shown in my 'sh runn', since I haven't configured the same, but pops up when I am checking out VRFs.

Also, kindly help me understand what exactly were you trying to point out in your earlier post.

Thanks

Cheers,

~sultan

New Member

Re: Route Distinguisher 0:0 !!!

Hi Sultan,

Yeah. Me too. I was eager to know this RD since it's rd 0:0 . Normally start with number range rather than zero zero.

From the configuration, I'am able to see other routes and no issues on the MPLS VPN routing. I thought that RD 0:0 got something weird or else...:)

cheers!

maher

Cisco Employee

Re: Route Distinguisher 0:0 !!!

Hi Maher,

We denied 0:0 for the RD by CSCeh12594, but revert back by CSCei09876 due to customer demand.

Hope this information completes your testing.

Regards

Sanjeewa

New Member

Re: Route Distinguisher 0:0 !!!

Hi Sanjeewa,

Thanks for the info. BTW, does this means that, on cisco router, it shouldn't be configured as rd 0:0 . I dont understand the "CSCei09876 due to customer demand". Can you explain more briefly?

thanks in advanced.

cheers.

maher

Cisco Employee

Re: Route Distinguisher 0:0 !!!

Hi Maher,

There was a change/modification (filed under CSCeh12594) in the code, with that customers could no longer configure 0:0 as RD.

So they complain and we had to revert back the above modification, allowing them to configure 0:0 as RD, again this change is filled under CSCei09876.

The reason I gave this information is simply because of sometimes you may see an IOS version denying 0:0 and sometimes allowing 0:0 for RD.

Please let me know if I answered your question, regret for the delay since I was busy.

Regards

Sanjeewa

Cisco Employee

Re: Route Distinguisher 0:0 !!!

Hi Sultan,

I presume this is a lab router, are you able to reload both routers and publish router configs, versions if problem persists.

Thank you

Sanjeewa

New Member

Re: Route Distinguisher 0:0 !!!

Hello Sanjeewa,

No, this being a production router I cannot reload it. I would like to know how exactly am I getting this value, when I haven't configured the same.

Here is the version information.

XXX_XXX_CE02#sh ver

Cisco IOS Software, 3800 Software (C3825-ADVIPSERVICESK9-M), Version 12.4(7a), RELEASE SOFTWARE (fc3) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2006 by Cisco Systems, Inc.

Compiled Mon 24-Apr-06 23:14 by ssearch

ROM: System Bootstrap, Version 12.3(11r)T2, RELEASE SOFTWARE (fc1)

ROM: Cisco IOS Software, 3800 Software (C3825-IPBASE-M), Version 12.4(3c), RELEASE SOFTWARE (fc1)

XXX_XXX_CE02 uptime is 4 weeks, 1 day, 2 hours, 33 minutes System returned to ROM by power-on System image file is "flash:c3825-advipservicesk9-mz.124-7a.bin"

This product contains cryptographic features and is subject to United States and local country laws governing import, export, transfer and use. Delivery of Cisco cryptographic products does not imply third-party authority to import, export, distribute or use encryption.

Importers, exporters, distributors and users are responsible for compliance with U.S. and local country laws. By using this product you agree to comply with applicable laws and regulations. If you are unable to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:

http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to export@cisco.com.

Cisco 3825 (revision 1.1) with 223232K/38912K bytes of memory.

Processor board ID FHK1017F1WH

2 FastEthernet interfaces

2 Gigabit Ethernet interfaces

1 Virtual Private Network (VPN) Module

DRAM configuration is 64 bits wide with parity enabled.

479K bytes of NVRAM.

62720K bytes of ATA System CompactFlash (Read/Write)

Configuration register is 0x2102

*************************

As for VRFs, I have just configured 3 of them and none of them have RD 0:0.

Thanks

Cheers,

~sultan

Cisco Employee

Re: Route Distinguisher 0:0 !!!

Sorry, I was busy with some other issues.

Could you please email me sanjeewa@cisco.com

Thank you

Sanjeewa

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