I am interested in this as well.  If you find something out, please let
me know.

I currently have one border router that I would like to use VRRP to
provide redundancy at the core.  I have 2 QoS machines that are
transparent bridges that I use STP since it is layer 2, if one fails,
the switch enables the hot-spare and there may be a 30 second outage for
the convergence.  That is for layer 2...

Thanks,

Eric Rogers
Precision Data Solutions, LLC
(317) 831-3000 x200


-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Sam Tetherow
Sent: Friday, February 22, 2008 2:53 AM
To: [EMAIL PROTECTED]; Mikrotik discussions; WISPA General List
Subject: [WISPA] Mikrotik VRRP

I've been testing out VRRP and it seems to work pretty well if you want 
to fail over from one machine to another on a single interface.  But 
what I would really like to be able to do is duplicate my MT routers 
against equipment failure rather than network failure.

Example:

CPE ---- AP ---+------MT1----- + ----- WORLD
                      |                      |
                      +------MT2 ----- +

MT1 and MT2 are both routing between AP and the world.
AP is 172.16.2.0/24
WORLD is 10.0.0.0/24
MT1 has
Internal (AP) address of 172.16.2.1
External (WORLD) address of 10.0.0.1
vrrp1 (AP) address of 172.16.2.254
vrrp2 (WORLD) address of 10.0.0.254

MT2 has:
Internal (AP) address of 172.16.2.2
External (WORLD) address of 10.0.0.2
vrrp1 (AP) address of 172.16.2.254
vrrp2 (WORLD) address of 10.0.0.254

172.16.2.0/24 is routed to 10.0.0.254
172.16.2.0 side has a default gateway of 172.16.2.254

When the AP side of MT1 is unplugged  MT2 takes over and only a couple 
of pings are dropped.  However if the WORLD side of MT1 is unplugged 
about 4 pings time out and then I start getting destination unreachable.

The VRRP failover works on both sides.  If the WORLD side of MT1 is 
unplugged I can ping 10.0.0.254 and get a response from MT2.  But on the

internal end of things MT1 is still 172.16.2.254 so I get the host 
unreachable message.

So what I'm really looking for is high availability for the router and I

was hoping that VRRP would do the trick.  I thought about bridging but 
at NOC I have several networks that all connect to my main MT router and

I really don't want to bridge the traffic.

If anyone has a clue, or can definitively say it can't be done with VRRP

I would greatly appreciate the help.

-- 
        Sam Tetherow
        Sandhills Wireless



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