From: Simon Baxter (Simon.Baxter@xxxxxxxxxxxxxx)
Date: Wed Aug 09 2000 - 05:05:57 GMT-3
An interesting 'snippit' from CCO :
Restrictions
Cisco IOS releases prior to Release 12.0 implemented NHRP draft version 4.
Cisco IOS Release 12.0 implements NHRP draft version 11. These versions are
not compatible. Therefore, all routers running NHRP in a network must run
the same version of NHRP in order to communicate with each other. All
routers must run Cisco IOS Release 12.0 or else all routers must run a
release prior to Release 12.0, but not a combination of the two.
The enhancements have the following additional restrictions:
They work on CEF platforms only.
They work on ATM media only.
BGP must be configured in the network where these enhancements are running.
Prerequisites
Before configuring the feature whereby NHRP initiation is based on traffic
rate, the router must have the following:
ATM must be configured.
CEF switching or CEF distributed switching must be enabled.
BGP must be configured on all routers in the network.
If you have CEF switching or CEF distributed switching and you want NHRP to
work (whether with default values or changed values), you must have ip cef
accounting non-recursive configured.
mmm.
-----Original Message-----
From: Simon Baxter
Sent: Wednesday, August 09, 2000 5:37 PM
To: John Conzone; Scott F. Robohn; Jon Mendoza; ccielab
Subject: RE: understanding NHRP
How did you guys get on making NHRP simple??
Simon
-----Original Message-----
From: John Conzone [mailto:jkconzone@home.com]
Sent: Wednesday, July 26, 2000 9:37 PM
To: Scott F. Robohn; Jon Mendoza; ccielab
Subject: Re: understanding NHRP
Scott, thanks for the reply. That helps a ot, and I'm going toplay with
it some. I'm going over all the 12.1 docs and trying to configure evreything
and understand most of it.
On my previous attempt, I had a topic that I didn't totally understand
smack in the middle of my network and it sunk my whole effort.
Granted, it wasn't quite as obscure as NHRP, but I have nightmares of
getting in there and seeing "configure multipoint tunnels using NHRP between
r2,r3 and r4" and they ain't gonna get me like that twice, at least if I can
help it!
----- Original Message -----
From: "Scott F. Robohn" <sfr@mentortech.com>
To: "John Conzone" <jkconzone@home.com>; "Jon Mendoza"
<Jon.Mendoza@wareforce.com>; "ccielab" <ccielab@groupstudy.com>
Sent: Tuesday, July 25, 2000 9:13 PM
Subject: Re: understanding NHRP
> John/Jon,
>
> Funny thing - this is the first time I've heard NHRP come up
> as a discussion topic on the list or for the lab exam at
> all. Although I suppose it's a legitimate topic/technology
> - it has features in IOS.
>
> There was alot of hooplah surrounding NHRP with ATM,
> initially for CLIP (RFC1577). The ATM Forum took the NHRP
> concepts and basically turned it into MPOA for LANE. MPOA
> lets you take a LANE client (which is really an MPOA Client
> or MPC) and give it the ability to form cut-through SVCs to
> other MPC's in other layer 3 subnets. It's essentially SVCs
> across L3 boundaries.
>
> What was the Next Hop Server (NHS) in NHRP is the MPOA
> Server (MPS) in MPOA. It forwards requests for those
> cut-through SVCs in the form of NHRP messages.
>
> You know MPOA is working when you see SVCs formed between
> MPCs in different L3 networks.
>
> If you come take CATM from me, I have a really good MPOA lab
> :)
>
> If anyone knows of a non-ATM NHRP implementation, I'd be
> interested in the details.
>
> Thanks,
> Scott
>
> ps - What is the 'section 12.1' you refer to?
>
> John Conzone wrote:
> >
> > Jon, I have a pretty good home lab and am going to try it. I was
hoping
> > to get a better grasp of the concept before I did that, but maybe just
doing
> > will help.
> > I'm not sure I'll know if its working or how to monitor it, though.
> > ----- Original Message -----
> > From: "Jon Mendoza" <Jon.Mendoza@wareforce.com>
> > To: "'John Conzone '" <jkconzone@home.com>
> > Sent: Tuesday, July 25, 2000 6:43 PM
> > Subject: RE: understanding NHRP
> >
> > > John,
> > >
> > > I've had the same issue.. a ccie had one mentioned to go thru the IOS
> > > documentation and try to implement as many of the technologies
described
> > by
> > > the configuration at least once.
> > >
> > > I have not really been able to try it but one of these days I will
give it
> > a
> > > shot in my home lab.
> > >
> > > I will keep you updated and possibly forward the configs to you once
I'm
> > > done and successful.
> > >
> > >
> > > Regards,
> > >
> > > Jon
> > >
> > > -----Original Message-----
> > > From: John Conzone
> > > To: ccielab
> > > Sent: 7/25/00 3:15 PM
> > > Subject: understanding NHRP
> > >
> > > I've gone over the NHRP section in 12.1, but am still a little
fuzzy
> > > on just exactly what it provides. It seems to create dynamic tunnels
in
> > > a NBMA network, although FR isn't mentioned. I'm assuming this is
> > > because most frame implementations don't support SVCs so a dynamic
point
> > > to point connection can't be established. Can someone point me at a
more
> > > in depth explanation, and explain what exactly we are gaining? I'm
> > > having a little trouble grasping the concept.
> > > Thanks!
> > >
> > >
> >
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