Re: [Idr] Request to adopt draft-heitz-idr-large-community - Working Group Adoption call (9/6 to 9/20)

[heasley <[e-mail]>]

Wed, Sep 14, 2016 at 10:33:51PM +0200, Robert Raszuk:
> Sander,
> 
> I think there is still some confusion what the plan is. Let me try to
> explain as this is key for this discussion.
> 
> BGP UPDATE can have given attribute present in the message only once and no
> one is attempting to change that.
> 
> What we have defined is a new attribute type for communities and within
> that type a common header. Treat this header as a TLV wrapper for
> communities.
> 
> As such within given attribute you can have many headers of the same type
> as current RFC will define how to parse given attribute.
> 
> And that allow to keep one attribute for any type of communities of any
> size. Be it large, wide, geo etc ... The common header can be present
> multiple types in the community attribute we are defining.

ie:

0                   1
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|  Attr. Flags  |Attr. Type Code|
|               | "MONGO COMMS" |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| total sum of  |
| MONGO COMMS   |
+-+-+-+-+-+-+-+-+

0                   1                   2                   3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|      Type     |  Flags  |R|C|T|            Length             |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                       Context AS Number                       |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                       VALUE MONGO COMM #1                     |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

0                   1                   2                   3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|      Type     |  Flags  |R|C|T|            Length             |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                       Context AS Number                       |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                       VALUE MONGO COMM #2                     |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

	usw....