So you are saying the client never sees the MAC address of RouterA? It only sees the MAC address of the "Virtual Router"?
Kim > > From: "Michael L. Williams" > Date: 2002/06/23 Sun AM 11:29:24 EDT > To: [EMAIL PROTECTED] > Subject: Re: HSRP [7:47177] > > This isn't quite right. See comments below. > > "Kim Graham" wrote in message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > This brings up a question. I understand that after the initial "hi I will > > be handling your requests please use me as your destination mac address". > > (Router talking to client). > > > > But what happens when the initial router fails and HSRP kicks in? After an > > unreachable, would ClientA send out an arp or would RouterB initiate the > > arping to re-establish connections to any client that was using RouterA > > after it noticed that RouterA was not responding? > > > > Scenario: > > > > > > ClientA ----- RouterA/B(HSRP) ------ ClientB > > > > ClientA sends a packet to ClientB > > ClientA talks to the Virtual RouterA/B -- RouterA/B sends to ClientB > > RouterA/B tells ClientA -- RouterA will be handling your requests. > > Router A never tells Client A that "Router A will be handling your > requests". As you mentioned, Client A talks to the Virtual Router via the > Virtual IP address which it ARPs to find the Virtual MAC. Client A never > knows which of the HSRP routers is "intercepting" and processing it's > requests.... When Client A sends a frame to the Virtual MAC to go out of > it's gateway, both Router A and Router B "hear" the packet, but only the > HSRP Active router will process it. So if, the janitor steps in and unplugs > Router A, then after Router B misses enough Hello packets from Router A, it > declares itself the Active HSRP router for that HSRP group, and at that > point it starts to process the information sent to the Virtual IP/Virtual > MAC. This is all transparent to the end clients, Client A in this example. > So as far as Client A knows, it's still sending traffic to the Virtual IP > via the Virtual MAC address it has in its ARP cache..... > > HTH, > Mike W. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=47236&t=47177 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
