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GLBP load balancing on Routers

Hello,

   I need to configure GLBP for load balancing for this network:

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VIP Expert

GLBP load balancing on Routers

Disclaimer

The  Author of this posting offers the information contained within this  posting without consideration and with the reader's understanding that  there's no implied or expressed suitability or fitness for any purpose.  Information provided is for informational purposes only and should not  be construed as rendering professional advice of any kind. Usage of this  posting's information is solely at reader's own risk.

Liability Disclaimer

In  no event shall Author be liable for any damages whatsoever (including,  without limitation, damages for loss of use, data or profit) arising out  of the use or inability to use the posting's information even if Author  has been advised of the possibility of such damage.

Posting

Besides PBR, there are other approaches you might use, "best" depends on what you're real requirements are.

For example, do you really need particular soruce VLANs to go via different paths, or are you looking for better or optimal performance?

You might just equally route from your L3 switch to both WAN routers.  This would provide basic load balancing.  If you need better treatment for some traffic, QoS policies on the WAN routers could provide that.

For optimal load balancing, OER/PfR on the WAN routers can dynamically load balance.  Here too QoS can provide different treatment for different traffic.

If you really want to direct traffic using gateways, you could trunk to both WAN routers, run HSRP (or GLBP) between them.

6 REPLIES 6
VIP Expert

GLBP load balancing on Routers

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.

Posting

What subnets do you actually want to GLBP?  Where's your subnets gateways?  Core switch is pure L2 or is it L3?

GLBP load balancing on Routers

Dear Joseph,

    My switch is Core switch 4500 (L3), and all the vlans are created on Core switch. I need to balance my traffic,

As,

Vlan 10 and vlan 20 should go from WAN 1 link.  

Vlan 30 should go from WAN 2 link.

And all the subnet gateways are configured on Core switch.

vlan 10 gateway 10.100.10.254

vlan 20 gateway 10.100.20.254

vlan 30 gateway 10.100.30.254

Rising star

GLBP load balancing on Routers

Hi,

I think with such requirement you can use Policy-based Routing (PBR) instead of GLBP. Create two access-lists one for subnets VLAN 10/20 second for VLAN 30. And route them with set ip nex-hop.

ip access-list extended 101

permit ip 10.100.10.0 0.0.0.255 any

permit ip 10.100.20.0 0.0.0.255 any

ip access-list extended 102

permit ip 10.100.30.0 0.0.0.255 any

route-map WAN1 permit 10

match ip address 101

set ip next-hop 10.100.10.3

route-map WAN2 permit 10

match ip address 102

set ip next-hop 10.100.10.4

int vlan 10

ip policy route-map WAN1

int vlan 20

ip policy route-map WAN1

int vlan 30

ip policy route-map WAN2

Hope it will help.

Hope it will help. Best regards, Abzal

GLBP load balancing on Routers

Hi Abzal,

    I can do PBR,but I need redundancy for it,if one WAN link fails then what shall I do.

Thanks

Rising star

GLBP load balancing on Routers

Hi Majed,

Ok, then try this one,

ip access-list extended 101

permit ip 10.100.10.0 0.0.0.255 any

permit ip 10.100.20.0 0.0.0.255 any

ip access-list extended 102

permit ip 10.100.30.0 0.0.0.255 any

IP SLA configurations:

ip sla 1

icmp-echo 10.100.10.3

timeout 500

frequency 1

ip sla schedule 1 life forever start-time now

ip sla 2

icmp-echo 10.100.10.4

timeout 500

frequency 1

ip sla schedule 2 life forever start-time now

track 10 rtr 1 reachability

delay down 1 up 1

!

track 20 rtr 2 reachability

delay down 1 up 1

route-map WAN1 permit 10

match ip address 101

set ip next-hop verify-availability 10.100.10.3 track 10

route-map WAN2 permit 10

match ip address 102

set ip next-hop verify-availability 10.100.10.4 track 20

ip route 0.0.0.0 0.0.0.0 10.100.10.3 track 10

ip route 0.0.0.0 0.0.0.0 10.100.10.4 track 20

int vlan 10

ip policy route-map WAN1

int vlan 20

ip policy route-map WAN1

int vlan 30

ip policy route-map WAN2

Refer this link with great explanation

https://supportforums.cisco.com/docs/DOC-8313

Hope it will help.

Hope it will help. Best regards, Abzal
VIP Expert

GLBP load balancing on Routers

Disclaimer

The  Author of this posting offers the information contained within this  posting without consideration and with the reader's understanding that  there's no implied or expressed suitability or fitness for any purpose.  Information provided is for informational purposes only and should not  be construed as rendering professional advice of any kind. Usage of this  posting's information is solely at reader's own risk.

Liability Disclaimer

In  no event shall Author be liable for any damages whatsoever (including,  without limitation, damages for loss of use, data or profit) arising out  of the use or inability to use the posting's information even if Author  has been advised of the possibility of such damage.

Posting

Besides PBR, there are other approaches you might use, "best" depends on what you're real requirements are.

For example, do you really need particular soruce VLANs to go via different paths, or are you looking for better or optimal performance?

You might just equally route from your L3 switch to both WAN routers.  This would provide basic load balancing.  If you need better treatment for some traffic, QoS policies on the WAN routers could provide that.

For optimal load balancing, OER/PfR on the WAN routers can dynamically load balance.  Here too QoS can provide different treatment for different traffic.

If you really want to direct traffic using gateways, you could trunk to both WAN routers, run HSRP (or GLBP) between them.

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