Nat,
This is one of those things that differientiate [sp?] a _LOGICAL_
drawing and a _PHYSICAL_ drawing. Figure 9-3 on that page shows
"Network 3.0.0.0" and "Network 2.0.0.0" This is a logical drawing.
These networks could be utilizing a HUB, Switch, or a direct connect
such as a cross-over cable. Typically, in the real world [assuming
you meant in a production enviroment] it is a switch.
Now, let's assume it is a switched network. The switch wouldn't send
out any "hello" type packets. The HRSP protocol is a _router_
protocol. So the routers are talking to each other, ensuring the
primary is alive and well, and if not, a take over by the secondaries.
The switch is just the medium.
But this brings up another question that I had not found until you
posted the link. And that was what about layer-2? IE: MAC address
resolution. How did a switch, using VLANs quite possibly, ensure it
went to the correct MAC address?
>From that link:
..." When you configure HSRP, the router automatically selects one of
the virtual MAC addresses from a range of addresses in the Cisco IOS
software that is within the range of Cisco's MAC address block"...
Aha! So the MAC address stays the same [as does the associated IP
address] But wait! How does the switch _relearn_ where that MAC
address is?
In other words:
Primary router A, with IP of 1.1.1.1 and Mac adder of x:x:x:x is off
switch port 5. Router A dies, and Router B takes over...using IP
1.1.1.1 and Mac adder of x:x:x:x now on switch port 8. But the switch
still thinks x:x:x:x is on switch port 5. How does he get updated??
[besides arp table purge] Yet to figure this one out...but I will
keep you updated, as I have been put on the HA [High Availability]
Project where I work.
FWIW, We are also looking at Cisco's Local director, F5's BigIP/3DNS,
and a combination of pure physical redundancy.
Troy Coulombe
Network Engineer, CCNA
...and all around nice guy
On 28 May 2000 03:17:35 -0400, [EMAIL PROTECTED] wrote:
>Hola newbies. I had a question that went unanswered a while back about load
>balancing and backup. I found the answer to it tonight. See this link for
>information:
>
>http://www.cisco.com/cpress/cc/td/cpress/ccie/ndcs798/nd2022.htm#xtocid185122
>
>Now for those of you in the real world.....no where in this doc do I see a switch. If
>there were one, do you just tell it to accept traffic from any
>of the routers, and are there weights or values to do this? Does the switch send some
>kind of hello packet to find out who the main router is
>or what???
>
>Thanks!
>
>Nat
>CCNA. MCSE, CNA
>
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