Thanks John,
I got it.
Thanks
Manish
John Neiberger wrote:
> If a given router does not understand or use the community attribute, the
> route is not dropped and the community is passed along in updates sent to
> other BGP neighbors. The statement you originally posted simply says this:
> Any given router need not use the community attribute, but that information
> must remain intact so that other routers might make use of it should they
> decide to do so.
>
> A BGP community is strictly an administrative attribute. It has zero effect
> on routing if your router is not configured to use that information.
> However, your router needs to forward that information intact to other
> neighbors in case they need it to enforce whatever routing or filtering
> policies they have implemented.
>
> HTH,
> John
>
> > I could understand this since this is a transitive attribute and
> therefore it can
> > transit the routers and can be passed.
> > But there is a condition imposed by whereby it says that the remote
> router maynot
> > understand the community but it shall be configured to propogate it to
> the next hop
> > destination or transit router else by default the communities are
> dropped. Now if the
> > communities are dropped "does this mean that the route is dropped" since
> the coomunity
> > attribute is resposible for the routes .......
> >
> > Thanks
> > Manish
> >
> > John Neiberger wrote:
> >
> > > Here's a guess. The BGP community attribute is optional, yet
> transitive.
> > > This means that a particular implementation of BGP on a router may not
> use
> > > or understand the concept of communities. However, because the
> attribute is
> > > transitive, it will be forwarded along to other neighbors who may be
> able to
> > > to use it.
> > >
> > > I'm sure someone will correct me if I have the wrong.
> > >
> > > Regards,
> > > John
> > >
> > > > What does this mean :
> > > >
> > > > "IF A ROUTER DOESNOT UNDERSTAND THE CONCEPT OF COMMUNITIES IT WILL
> DEFER
> > > TO THE NEXT ROUTER"
> > > >
> > > > Please help.
> > > > Thanks
> > > > Manish
> > > >
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