Re: [mpls] wg last call on draft-ietf-mpls-ldp-igp-sync-01.txt

[gaurav gupta <gaurav_gup1 at yahoo.com>]

Hi Priyanka,

Discouraging IP forwarding over a link does not help in LDP session establishment. Discouraging IP forwarding over a link only prevents traffic loss if IGP is up over a link but LDP bindings are not already exchanged. The draft mentions 3 reasons for a potential black-holing of traffic: configuration error, implementation bug or the reason which I just mentioned above. To my understanding the draft only prevents from the 3rd reason.

Hope this helps.

 

Thanks,
Gaurav

----- Original Message ----
From: priyanka gupta <busybee_pg at yahoo.com>
To: mpls at ietf.org
Sent: Thursday, April 17, 2008 4:21:22 AM
Subject: Re: [mpls] wg last call on draft-ietf-mpls-ldp-igp-sync-01.txt

Comments:

I am not able to understand that how discouraging the IP forwarding over a link where LDP is not fully established help in LDP session establishment.

As you mentioned the reason for blackhole could be -configuration error or - An implementation bug.   

Can you help me in uderstanding this.

Secondly,

"It is recommended this that both side of a link implement mechanism to be effective and to avoid asymmetric link costs which could 

   cause problems with IP multicast forwarding."

what exactly mean by IP multicast forwarding problems?

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