Comments on: Configuring redundancy with GLBP

By: Engelbert

Engelbert — Mon, 22 Aug 2011 16:51:31 +0000

i would like to know if i can use this protocol in a core switch 4506 and 4507??

By: Prabhakant

Prabhakant — Fri, 27 May 2011 12:41:57 +0000

Still i am not getting your solution, i read you links but my doubt is i congifured load balancing but when i am taking report utilazation is showing very high for one router and approx null in second router.

router1-i(config)#interface vlan10
router 1#ip address 172.16.1.2 255.255.255.0
router1#glbp 1 ip 172.16.1.1
router1(config-if)#glbp 1 preempt
router1(config-if)#glbp 1 priority 150

router2-i(config)#interface vlan10
router 2#ip address 172.16.1.3 255.255.255.0
router2#glbp 1 ip 172.16.1.1
router2(config-if)#glbp 1 preempt

but still load balancing not happening.

By: Fabio Semperboni

Fabio Semperboni — Fri, 27 May 2011 07:52:49 +0000

@Prabhakant: check this link: http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6554/ps6600/product_data_sheet0900aecd803a546c.html

By: Fabio Semperboni

Fabio Semperboni — Fri, 27 May 2011 07:52:09 +0000

From PC you can check the arp table.
You can check the traffic using SNMP query.
Waht type of loop?

By: Prabhakant

Prabhakant — Thu, 26 May 2011 14:55:51 +0000

Hi all.

my concern what is the use of Glbp is incoming traffis is high.
i have two router on both configured the glbp but at time only one is working because my incoming traffic is high.is any way to share the incoming traffic on two links?

By: Dyobbs

Dyobbs — Thu, 19 May 2011 11:29:48 +0000

How do you know in which traffic does the PC goes to? Can you monitor the traffic for each of the links? What happens when there’s a loop? How will you react?

By: Fabio Semperboni

Fabio Semperboni — Tue, 17 May 2011 08:17:57 +0000

Try to check this link http://www.cisco.com/en/US/docs/ios/12_2/12_2y/12_2yx11/feature/guide/ft_vpnha.html

By: Janaka

Janaka — Tue, 17 May 2011 06:55:34 +0000

Can we use GLBP in a site to site VPN to agregare bandwidth. Site A has 2 internet connection & site B has 1 or 2 connection

By: polo

polo — Fri, 06 May 2011 10:42:28 +0000

great article, tks you.

By: Fabio Semperboni

Fabio Semperboni — Tue, 22 Mar 2011 11:49:00 +0000

The AVG manage the AVF MAC address. “The AVG answers all ARP requests for the virtual router address. Which MAC address it returns depends on which load-balancing algorithm it is configured to use.”
The AVF are routers that forward the IP packet.
Remeber that the AVG is also an AVF!

By: Nizar Makarem

Nizar Makarem — Sat, 15 Jan 2011 20:29:05 +0000

My concern is this, think of layer 2:
Imagine you have 4 routers connected to a switch, every router to a different port on the switch, when the AVG responds to ARP requests with the virtual MAC of the AVF, the switch port that is connected to the AVG update its MAC table, and the switch thinks that this MAC address is associated with the port where the ARP response was received, in this case, the port where is connected the AVG, and not where it really is the AVF, it happens beacuse the switches associates the source MAC address of frames with the ports where they are received.
So, what am i missing? How does the AVG do for the switch to forward frames to ports which AVF are connected to?

By: Sunil Sharma

Sunil Sharma — Tue, 19 Oct 2010 07:11:05 +0000

Hi Team

I m doing my CCNP and I wd like to give this doc as ” FIVE STAR ” and its really cooool stuff on Cisco redundancy protocol.

Thanks
Sunil Sharma