I have been asked to investigate implementing HSRP on two routers. All the information I have collected states that the HSRP commands. This document provides a sample configuration for HSRP in Cisco Series switches for Siwtch A is active state of HSRP and Switch B is in standby state. How to Configure HSRP on a Cisco Router (with GSN3 lab) these routers could be multilayer switches such as a Cisco or as well.

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All hosts on the segment and in the VLAN will use this address as their default gateway. However if you need to have a different behavior, meaning different priority, preempt, etc. Pervis Ars Tribunus Militum Tribus: May 8, Posts: You can have multiple interfaces and networks configured using the same standby group number if the fail over behavior needed is the same.

Mon Nov 30, 8: Asus has built a fast router with something for everyone Asus has built a fast router with something for everyone by Dan Dziedzic. Storage by Rick Broida Nov 12, Originally posted by Frennzy: R2 config interface ethernet1 R2 config-if ip address In our scenario above, if R1 fails, R2 will become active.

After the switches times-out the virtual MAC address from the forwarding table, the traffic from the server to the virtual MAC becomes “unknown unicast”, where the switch defaults to hub-like behavior and floods the traffic out all ports.

Keep in mind GLBP can actually be worse depending on your spanning-tree topology.

Hello real routing protocols. So basically once again, my theory is better network topology trumps GLBP for throughput. However, when the router forwards a datagram to the host, it uses the physical MAC address.

Sign up using Facebook. In this scenario, HSRP provides high network availability since it routes IP traffic without depending on a single router. If both routers are set to the same priority, the first router to come up will be the active router. Granted, this is similar to altering timers, but it’s a much more graceful alteration than manipulating the CAM table and ARP timers. Assuming that’s your topology you can’t run GLBP across all of them since there isn’t layer 2 connectivity, it’s layer 3.


On all Ciwco ethernet interfaces facing an ethernet switch: Exactly right about the core switches and routers. CompactFlash Card, expansion slot. It’s easier to get needed circuit upgrades when your primary circuit is nearly saturation than when you’ve got two circuits that both have plenty of room to grow and would only have a problem if one of them failed during peak hours.

Nortel had this type of thing for a while, so do most stack type configurations and Juniper’s virtual chassis stuff. By periodically sending a GARP, the router refreshes the switch forwarding table.

cisco 6509 HSRP双机热备份配置

Networking by Shara Tibken Oct 22, Sun Nov 22, 6: The problem occurs when PC1’s traffic returns via R2. Note though that this depends on your hardware and software combination, not all HSRP implementations offer this.

Why would my router be participating in STP as a root bridge? R2 config interface ethernet0 R2 config-if ip address Our Cisco WAN routers have equal-cost routes to all other sites; thus we can see asymmetric routing effects all the time. Weylin Csico 11 3. Miscellaneous Height Rack Units. This option works best if you have a decent-sized layer2 switched network, a reasonable number cidco ARP entries and few routed interfaces. Something has to be blocking if your links between distribution switches is a trunk.

In the former scenario, the urgency is easier to communicate, whereas in the latter, there’s a lot of temptation to defer the expense because the only time you’ll have a problem is when there’s a failure. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.


Depending on the model router you are using, this can be a lot money just sitting idle. IMO, it’s far better to pick a default gateway and stick to it. Aug 4, Posts: This option avoids hideously-long CAM timers in Option 2 at the expense of more configuration.

Basic Information of Configuring HSRP on a Cisco Router – Router Switch Blog

I’m planning to add failover with our redesign. Stacking Cat 3k b. If you are in a situation where you need to defer the expense and use the additional circuit capacity of your backup circuit, it’s still an option, but it forces decision makers to consciously pull the trigger to decide to trade redundancy for capacity, rather than give them the option of sitting on their hands and making that decision through inaction.

I do think this type of thing is a superior topology, if you need higher reliability for host connections. Mar 12, Posts: Originally posted by Uhlek: GLBP can certainly work well in certain situations, but in my experience and opinion they don’t occur all that often in practice. The second problem I’ve got with it is that it introduces asymmetric routing.

Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. I’ve got Friday brain melt. Jan 26, Posts: If the distribution layer switches are layer 2 only, then only the core switches should run whichever FHRP you choose.