Re: bgp4-17 5.1.3 immediate next hop

[Alex Zinin <[e-mail]>]

Tom,

 I think you might have gotten confused with terms, i.e., what
 resolves something and what gets resolved.

 We resolve an address (specifically the address in the NEXT_HOP
 attribute) to a direct next-hop address. We do this by performing
 a routing table look up for the address to be resolved.
 The route that gives us the result is the resolving route.

-- 
Alex Zinin

Saturday, January 11, 2003, 6:22:02 AM, Tom Petch wrote:

> Each time I read this paragraph I am left wondering if I
> really understand it!  The use of 'resolving' conveys to me
> something on-going and incomplete, surely the opposite of
> what is intended.  Might I suggest

>   The NEXT_HOP attribute is used by the BGP speaker to
> determine the
>    actual outbound interface and immediate next-hop address
> that should
>    be used to forward transit packets to the associated
> destinations.
>    The immediate next-hop address is determined by
> performing a
>    recursive route lookup operation for the IP address in
> the NEXT_HOP
>    attribute using the contents of the Routing Table (see
> Section
>    9.1.2.2). The

> *** result of this operation will always will always resolve
> the outbound interface and may resolve either the next-hop
> address or an attached subnet to be used. If the operation
> resolves the next-hop address, this address should be used
> as the immediate next-hop address for packet forwarding. If
> the operation does not resolve the next-hop address but does
> resolve the attached subnet to be used, then the address in
> the NEXT_HOP attribute should be used as the immediate
> next-hop address. ***


> Tom Petch, Network Consultant
> [e-mail]
> +(44) 192 575 3018