GLBP

Unanswered Question
Feb 24th, 2010

Hi,

I configured our WAN routers to use glbp with the folloing configuration:

track 1 interface FastEthernet0/0 ip routing
!
track 2 interface FastEthernet0/0 line-protocol


Router 1

interface FastEthernet0/1
ip address 1.1.1.2 255.255.255.0
duplex auto
speed auto
glbp 10 ip 1.1.1.1
glbp 10 priority 200
glbp 10 preempt
glbp 10 weighting track 1
glbp 10 weighting track 2


Router 2

interface FastEthernet0/1
ip address 1.1.1.3 255.255.255.0
duplex auto
speed auto
glbp 10 ip 1.1.1.1
glbp 10 priority 200
glbp 10 preempt
glbp 10 weighting track 1
glbp 10 weighting track 2

Where the Fast0/1 connected to LAN and 0/0 connected to the SP.

When I do the monotiring the link, foun that the two routers do not work roun robin.

I noted that one of them work for cerin time and the othe in another time. The did not work together.

Note : for the outbound traffic

Thanks..

I have this problem too.
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Giuseppe Larosa Wed, 02/24/2010 - 06:29

Hello Amar,

what is on the internal GLBP enabled interface?

if there is only one client like a firewall this behaviour is normal because GLBP works by answering to ARP requests for the VIP with different MAC addresses (those of AVF virtual forwarders). if only one client is connected it will use only one router for all the time the ARP entry is alive in its ARP table.

Hope to help

Giuseppe

amarmn1975 Wed, 02/24/2010 - 07:37

Thanks..

The two routers are connected to the cores switched each router to each switch. There is HSRP for the VLans.

That is mean the primary core talk to the GLBP.

Is there is any solution to force the switch to talk to the two routers.

Regards...

Ammar Al Hayyani

IP Telephony Specialist

Information Technology

Abu Dhabi Ports Company

Phone +971 2 695 2142   +971 50 6146553

Fax +971 2 695 2111

Email [email protected]

PO Box 54477, Abu Dhabi, UAE

Website www.adpc.ae

Giuseppe Larosa Wed, 02/24/2010 - 09:52

Hello Ammar,

>> Is there is any solution to force the switch to  talk to the two  routers.

if all devices are under your control I would deploy a dynamic routing protocol.

the edge routers may be configured to generate a default route with the same parameters.

Core device will install both routes as equal cost paths.

You can use OSPF or EIGRP for this (this is cisco proprietary)

the minimum solution would be the use of two HSRP groups one with edge router1 active and one with edge router2 active providing the IP next-hops of two static default routes.

Hope to help

Giuseppe

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