[quagga-dev 11126] Re: Errors in implementing RFC 6793 (BGP Support for Four-Octet Autonomous System (AS) Number Space)

Abhishek Talwar/HYD/TCS abhishek.talwar at tcs.com
Wed Mar 26 05:14:24 GMT 2014


Hi Daniel,

I am not trying to disable it for testing. 
As i am working on the implementation of RFC 6793 (BGP Support for Four-Octet Autonomous System (AS) Number Space) which says a NEW BGP speaker(4-octet) will advertise its AS4 capabilities to the peer and and if the peer also advertises the same capabilities it will get to know that the peer is also 4-octet and then both the speakers can share there 4-octet ASN with each other.
And in an interaction between a NEW BGP speaker and an OLD BGP speaker the AS_PATH attribute must be encoded with 2-octet AS number(AS_TRANS if other peer is 4-octet).
 
But according to you if the 2-byte ASN will advertise the AS4 capabilities too , how will the NEW BGP speaker know that the peer is 2-byte and not 4-byte ?

NOTE : An interaction between a NEW BGP speaker and an OLD BGP speaker is only possible if the NEW BGP speaker sends AS_TRANS in place of its real ASN so that 2-byte AS will think that it is having an interaction with AS_TRANS but the real AS number is different.
 
Thanks and Regards
Abhishek Talwar

----- Original Message -----
From: Daniel Walton <dwalton at cumulusnetworks.com>
To: Abhishek Talwar/HYD/TCS <abhishek.talwar at tcs.com>
Cc: quagga-dev at lists.quagga.net
Sent: Tue, 25 Mar 2014 17:46:58 +0530 (IST)
Subject: Re: [quagga-dev 11123] Errors in implementing RFC 6793 (BGP Support for	Four-Octet Autonomous System (AS) Number Space)

Hi Abhishek,Even though a speaker might only have a 2-byte AS they should still advertise the 4-byte AS capability.  This is so the peer with the 2-byte AS will receive AS_PATHs with 4-byte AS values instead of AS_TRANS 23456.
Or are you looking to disable the 4-byte AS capability just for testing purposes?
Daniel

From: "Abhishek Talwar/HYD/TCS" <abhishek.talwar at tcs.com>
To: quagga-dev at lists.quagga.net
Sent: Tuesday, March 25, 2014 7:11:51 AM
Subject: [quagga-dev 11123] Errors in implementing RFC 6793 (BGP Support for        Four-Octet Autonomous System (AS) Number Space)

Hi All,

I am currently working on the Implementation of RFC 6793(BGP Support for Four-Octet Autonomous System(AS) Number Space). It says that a new BGP speaker(4 octet) should send capabilities to the old BGP speaker that it supports 4 octet AS number through the BGP capabilities. I have made 1 BGP as 4-octet by keeping its AS number as 65636 and other BGP 2-octet keeping its AS number as 200. But the code in quagga has already AS4 capabilities defined and when i try to remove it for 2-octet speaker it gives me an error :- Notification sent to neighbor 10.1.5.48:User reset
BGP: Notification sent to neighbor 10.1.5.48 : configuration change.

So how can i remove the AS4 capabilities from the code for the 2-octet BGP speaker.
Please provide some information in this regards.

 

-- 
Abhishek Talwar
Emp ID : 770072
Assistant System Engineer-Trainee
Tata Consultancy Services
GG4, Udyog Vihar
Phase - 4, Gurgaon
India
Contact Details : +91-8377882003
Mail to : abhishek.talwar at tcs.com



=====-----=====-----=====

Notice: The information contained in this e-mail

message and/or attachments to it may contain 

confidential or privileged information. If you are 

not the intended recipient, any dissemination, use, 

review, distribution, printing or copying of the 

information contained in this e-mail message 

and/or attachments to it are strictly prohibited. If 

you have received this communication in error, 

please notify us by reply e-mail or telephone and 

immediately and permanently delete the message 

and any attachments. Thank you
_______________________________________________
Quagga-dev mailing list
Quagga-dev at lists.quagga.net
https://lists.quagga.net/mailman/listinfo/quagga-dev


-- 
Abhishek Talwar
Emp ID : 770072
Assistant System Engineer-Trainee
Tata Consultancy Services
GG4, Udyog Vihar
Phase - 4, Gurgaon
India
Contact Details : +91-8377882003
Mail to : abhishek.talwar at tcs.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.quagga.net/pipermail/quagga-dev/attachments/20140326/a37e0d47/attachment-0001.html>


More information about the Quagga-dev mailing list