Re: Unicast RPF path

[Shuqian YAN <syan@comm.toronto.edu>]

could someone help to answer the question below...

thank you,

shuqian
On Fri, 5 Feb 1999, Shuqian Yan wrote:

> Hello, all
> 
> This is a question about unicast RPF model used in ns2.
> 
> If I have the following partial topology,
> 
> 1-----2-----3------4------5
> 
> numbers are representing nodes and the links between nodes are duplex
> links.
> 
> if some agent in node 1 unicast a pkt to the final destination,
> which is node 5. since I also want the pkt to be received by the 
> intermediate node, in my algorithm, I always use rpf-nbr to find 
> the next hop where the agent will be connected, the pkt is thus
> forwarded hop-by-hop based on RPF until finally reached node 5. 
> The overall path in this case is 1->2->3->4->5.
> 
> suppose node 5 unicast a pkt toward finaldst node 1, and again I want
> the pkt to be received at intermediate nodes, so I also use the rpf-nbr to
> find the next hop towards node 1. My question is: is the path for node 5
> unicast pkt hop-by-hop towards node 1 will be the reverse path of node 1
> unicast pkt hop-by-hop towards node 5, or is the path will be
> 5->4->3->2->1?  could the path be different for the two cases I described
> above?
> 
> thank you,
> 
> shuqian
> 
>