From: Michael Davis (miked@xxxxxxxxxx)
Date: Fri Feb 23 2001 - 19:03:02 GMT-3
In terms of L3, I think you could set a lower ospf cost on the active
router's (meaning preferred router) interface, in this case 10.1.1.1,
relative to 10.1.1.2, raise the hsrp priority and be sure to preempt. This
way, ospf will prefer that interface to get to 10.1.1.0. When the link goes
down and 10.1.1.2 becomes active, there will be no route to 10.1.1.0 via
10.1.1.1, and this path will be used.
I don't think you can filter incoming hosts based on destination mac because
doing so will interfere with hsrp's function by preventing the to routers
from communicating. I don't know about preventing hosts with wrongly
configured gateways. Perhaps dhcp or irdp may be solutions for the
misconfigured hosts.
----- Original Message -----
From: "Dustin L LaMascus" <lamascus@xs4all.nl>
To: <erickbe@yahoo.com>; "Andrew Short" <ashort@wingedwheel.net>
Cc: "CCIE" <ccielab@groupstudy.com>
Sent: Friday, February 23, 2001 4:22 PM
Subject: RE: HSRP and OSPF???
> Guess it wasn't enough detail.. I am aware that OPSF is a routing protocol
> and HSRP is a redundancy protocol, as I hope anyone subscribed to this
list
> is. ;-)
> If router 1 and router 2 are using HSRP both physical interfaces are still
> available (lets say 10.1.1.1 for R1 and 10.1.1.2 for R2, along with the
> "virtual" IP and MAC (lets say 10.1.1.3). The clients could set the
default
> gateway to the "standby" router IP and still send traffic over a PVC (at
> least outgoing) that should be sleeping, not the desired scenario. I would
> like to limit traffic to ONLY the active router but I have no control over
> the host's configuration (default gateway). I would also like to ensure
that
> OSPF continues to talk correctly in the event of a HSRP fail over with
> minimal convergence, if any.
>
> R1 and R2 both use OSPF on the LAN and redistribute into EIGRP for the
WAN..
>
> Possible solutions I have thought of:
> Some how filter packets on the 10. interface of the standby router based
on
> MAC ??
> Some how force OSPF to prefer the active router so that packets sent to
the
> standby router are redirected to the active router
> Change the real IP addresses on R1 and R2 to another ip range and not add
it
> to the OSPF or EIRGP process, this would make it so if a client were to be
> configured for the wrong default gateway the remote router would drop the
> packet due to not knowing the return route..
>
> Hope this is a little better defined, and btw I know that EIGRP is also a
> routing protocol ;-)
>
> Cheers,
>
> Dustin
>
>
> -----Original Message-----
> From: Erick B. [mailto:erickbe@yahoo.com]
> Sent: Friday, February 23, 2001 7:37 PM
> To: Andrew Short; Dustin L LaMascus
> Cc: CCIE
> Subject: Re: HSRP and OSPF???
>
> Some more notes. I've had to explain this to many
> folks. HSRP shares a virtual IP address between the
> HSRP devices in the same group on the same subnet. One
> is active and rest are in standby. The primary IP
> address and other IP services are up and running as
> normal still. HSRP does not put the whole interface in
> standby mode (this is what many of the folks I've
> talked to thought). If it's in standby then the
> virtual IP isn't active and thats it.
>
> Routing protocols do not announce routes using the
> HSRP IP address. HSRP is not a routing protocol.
>
> Andrew is right, HSRP/VRRP provide redundancy for
> hosts only.
>
> --- Andrew Short <ashort@wingedwheel.net> wrote:
> > Honestly,
> >
> > HSRP and OSPF should NEVER have anything to do with
> > each other. Operate
> > them on the same routers, sure, but you are talking
> > apples and oranges.
> >
> > OSPF is a routing protocol, let it choose it's
> > routes accordingly.
> >
> > HSRP is a high availability tool to serve hosts with
> > static routes
> > configured. And as far as I know, it doesn't work
> > on WAN interfaces (and
> > I don't know why it would, or why you'd want it
> > too).
> >
> > Think of HSRP as something that you aim at a HOST.
> >
> >
> > On Fri, 23 Feb 2001, Dustin L LaMascus wrote:
> >
> > > I would like to use HSRP on R1 and R2 for
> > redundancy to the WAN. I would also
> > > like to limit the OSPF network to using only the
> > HSRP (active) gateway.
> > > Hope this is enough detail..
> > >
> > >
> > > OSPF NETWORK
> > > | |
> > > | |
> > > | hsrp |
> > > R1-------R2
> > > | |
> > > | |
> > > FRAME CLOUD
> > > |
> > > |
> > > R3
> > >
> > >
> > > Dustin
>
>
>
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