From: Peng Zheng (zpnist@xxxxxxxxx)
Date: Wed Aug 28 2002 - 22:51:47 GMT-3
I know that. But it's same as I said. Enable bgp
always-compare-med has the same result as enable both.
--- Nick Shah <nshah@connect.com.au> wrote:
> Not sure what you mean here, but.. Consider this..
>
> 192.168.1.0/24 recd. from AS500 MED = 100
> 192.168.1.0/24 recd. from AS400 MED = 50
>
> if BGP deterministic-med is turned on, these both
> paths will NOT be chosen
> based on MED, because they are not from same AS.
>
> but if BGP always compare MED is turned on, then the
> path with 50 MED will
> be selected.
>
> rgds
> ----- Original Message -----
> From: "Peng Zheng" <zpnist@yahoo.com>
> To: "Nick Shah" <nshah@connect.com.au>
> Sent: Thursday, August 29, 2002 10:42 AM
> Subject: Re: deterministic med
>
>
> > But turn on bgp always-compare-med have the same
> best
> > path no matter if turn on bgp deterministic med.
> Is
> > that right?
> >
> >
> >
> > --- Nick Shah <nshah@connect.com.au> wrote:
> > > Jon
> > >
> > > I hope you have already read this paper..
> > >
> http://www.cisco.com/warp/customer/459/bgp-med.html
> > >
> > > regardless of that. I will list down the effect
> of
> > > these 2 commands.
> > >
> > > * By default (with none of these commands
> entered)
> > > MED is NOT compared when
> > > selecting the best path.
> > > * Turning on bgp deterministic-med, turns on the
> > > feature to compare MED,
> > > however it only compares MED, if prefix is
> received
> > > from same neighbor and
> > > the best man wins
> > > * Turning on bgp always-compare-med, starts
> > > comparing 'same prefix' recd.
> > > from 'different neighbors' and the best man wins
> > > * Turning on both of them may really not be
> > > required, but it basically
> > > compares if prefixes are recd. in groups of AS's
> > > (say same prefix from AS
> > > 200, via 2 neighbors, and same prefix from AS
> 100
> > > via 1 neighbor).
> > >
> > > rgds
> > > Nick
> > > ----- Original Message -----
> > > From: "Jon O'Nan" <jononan@columbus.rr.com>
> > > To: <ccielab@groupstudy.com>
> > > Sent: Thursday, August 29, 2002 8:58 AM
> > > Subject: deterministic med
> > >
> > >
> > > > Am I correct that:
> > > >
> > > > bgp deterministic med - compares med within
> AS
> > > >
> > > > VS.
> > > >
> > > > bgp always-compare-med - compares med from
> another
> > > AS
> > > >
> > > >
> > > > Thanks
> > > > Jon
> > > >
> > >
> >
>
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