From: Dustin L LaMascus (lamascus@xxxxxxxxx)
Date: Fri Feb 23 2001 - 18:22:42 GMT-3
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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