From: ccie2be (ccie2be@nyc.rr.com)
Date: Sun Jun 26 2005 - 13:59:33 GMT-3
Hi Chris,
This multipoint GRE tunnel stuff is new to me.
Can you confirm my assumption that this is an alternative to configuring
multiple p2p GRE tunnels?
And, when the tunnel endpoint isn't configured, how does GRE know or find
out what destination ip address to use?
TIA, Tim
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Chris Lewis (chrlewis)
Sent: Sunday, June 26, 2005 12:48 PM
To: Danshtr; Ram Shummoogum
Cc: caccamucca@hotmail.com; ccielab@groupstudy.com
Subject: RE: large number of OSPF neighbors
Multipoint GRE is just the same as regular GRE, the only diffrence is
that with multipoint GRE, the source address is not checked on incoming
packets, so if you know how to configure regular GRE, mgre is basically
the same with two exceptions, first is tunnel mode gre multipoint, the
second is you do not have to specify a tunnel destination, just the
tunnel source. You can just take the encryption and nhrp parts out of
the config in http://www.cisco.com/warp/public/471/dcmvpn.html#configs
as follows:
interface Tunnel0
ip address 192.168.1.1 255.255.255.0
no ip redirects
ip mtu 1440
tunnel source FastEthernet0/0
tunnel mode gre multipoint
Chris
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Danshtr
Sent: Sunday, June 26, 2005 7:23 AM
To: Ram Shummoogum
Cc: caccamucca@hotmail.com; ccielab@groupstudy.com
Subject: Re: large number of OSPF neighbors
Hi All,
Where can I find documentation about multipoint GRE, whithout IPSec?
On 6/24/05, Ram Shummoogum <rshummoo@ca.ibm.com> wrote:
> This is a DMVPN network where all the 250 neighbors are stubs.
>
>
>
>
>
> "cacca mucca"
> <caccamucca@hotma
> il.com>
To
> Ram
Shummoogum/Quebec/IBM@IBMCA,
> 06/23/2005 05:08 ccielab@groupstudy.com
> PM
cc
>
>
Subject
> RE: large number of OSPF
> neighbors
>
>
>
>
>
>
>
>
>
>
> Obiously, you have a design issue. At one time, Cisco recommended max
> of 100 routers in an area. I don't know what the number is, but you
> need a good core network design and 250 routers in one area is in my
> opinion "BAD, REALLY BAD." When 1 router's link flaps all other
> routers in an area need to recalculate and reconverge.
>
> Break up the areas, back bone, stubby, not so stubby, etc.
>
> I'm assuming that most routers have only one path back to the core
> router, break them into managable stub areas.
>
>
>
> >From: Ram Shummoogum <rshummoo@ca.ibm.com>
> >Reply-To: Ram Shummoogum <rshummoo@ca.ibm.com>
> >To: ccielab@groupstudy.com
> >Subject: large number of OSPF neighbors
> >Date: Thu, 23 Jun 2005 13:56:43 -0400
> >
> >I have a 7206 router with 250 ospf neighbors and intermittently
> >losing neighors that go into init mode for as long as 5 minutes
sometime.
> >Anyone out there running successfully with that many neighbors? If
> >yes,
> are
> >you tuning any special parameters.
> >
> >Thanks
> >
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-- Best regards, Dan
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