we have planned to impliment GLBP between outside interface of firewall and beween two Routers. My query is when i was tested by configuring GLBP it was not shared load between these two Routers. Kindly help me on this
interface GigabitEthernet0/0 ip address 10.X.X.2 255.255.255.0 no ip redirects no ip unreachables no ip proxy-arp ip nat inside ip virtual-reassembly no ip route-cache cef no ip route-cache no ip mroute-cache duplex full speed 100 no mop enabled glbp 1 ip 10.X.X.1 glbp 1 priority 110 glbp 1 weighting track 1 decrement 10 glbp 1 weighting track 2 decrement 10 end
interface GigabitEthernet0/0 ip address 10.X.X.3 255.255.255.0 no ip redirects no ip unreachables no ip proxy-arp ip nat inside no ip virtual-reassembly no ip route-cache cef no ip route-cache no ip mroute-cache duplex auto speed auto media-type rj45 no mop enabled glbp 1 ip glbp 1 priority 150 glbp 1 preempt glbp 1 weighting track 1 decrement 50 glbp 1 weighting track 2 decrement 50 end
3825#sh glbp GigabitEthernet0/0 - Group 1 State is Active 1 state change, last state change 04:48:11 Virtual IP address is .1 Hello time 3 sec, hold time 10 sec Next hello sent in 1.492 secs Redirect time 600 sec, forwarder timeout 14400 sec Preemption enabled, min delay 0 sec Active is local Standby is .2, priority 110 (expires in 9.472 sec) Priority 150 (configured) Weighting 100 (default 100), thresholds: lower 1, upper 100 Track object 1 state Up decrement 50 Track object 2 state Up decrement 50 Load balancing: round-robin Group members: 0024.c4b0.7640 (.2) 0024.c4bc.7df0 (.3) local There are 2 forwarders (1 active) Forwarder 1 State is Active 1 state change, last state change 04:47:33 MAC address is 0007.b400.0101 (default) Owner ID is 0024.c4bc.7df0 Redirection enabled Preemption enabled, min delay 30 sec Active is local, weighting 100 Client selection count: 1 Forwarder 2 State is Listen MAC address is 0007.b400.0102 (learnt) Owner ID is 0024.c4b0.7640 Redirection enabled, 597.976 sec remaining (maximum 600 sec) Time to live: 14397.976 sec (maximum 14400 sec) Preemption enabled, min delay 30 sec Active is .2 (primary), weighting 100 (expires in 7.976 sec)
do I understand correctly you have your FW WAN interface connected to an Ethernet segment together with two Cisco routers and expect the traffic sent from the FW to the routers to load balance between those two routers?
If yes, GLBP will not help you at all :-(
As it's based on two (or more) routers replying to the virtual IP address ARP requests.
In your case, the FW will send an ARP request for the vitrual IP address. One of the routers will reply.
So the FW will use that router to send ALL the traffic out.
When the virtual IP address ARP cache entry expires on the FW (after 4 hours on most devices by default), it will send another ARP request.
And again one (possibly the second) router replies.
Again, the FW will send ALL traffic to the router which replied.
So it has no sense using GLBP in this topology.
It's useful in case of a huge LAN with many PCs sharing two routers as default GW, e.g. But not in this case.
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