Question

7206VXR Load Sharing with Failover

Asked by: jajjones

Hey !

Putting a co-located DC design together for a client.  basic topology below


      E3 Primary                                  E3 Secondary
         l                                                        l
       Ethernet                                      Ethernet
         l                                                       l
    7206VXR                                        7206VXR
         l                                                      l
    3750 Stack Mem 1  ---Stackwise-- 3750 Stack Mem 2
 

How do I configure the 7206VXRs for load sharing but also to failover to a single E3 in the event of one of the E3's failing ????????   Should I GBLP on the LAN interfaces of the 7206 ?????

Any assistance appreciated as always.


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Asked On
2005-09-22 at 06:39:26ID21570462
Tags

7206

,

failover

Topic

Network Routers

Participating Experts
1
Points
500
Comments
4

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Answers

 

by: lrmoorePosted on 2005-09-22 at 06:56:44ID: 14936687

Assuming that you are using BGP between the 7206 and the ISP on the E3, then I would suggest using the capabilties of the 3750 to be your primary router and using OSPF between the 2 routers and the 3750 stack.
Even if all you use is default gateway on each router, OSPF will load-share between the two 7206's quite nicely.
I would not consider either GLBP or HSRP in this instance. Just let the dynamic routing do what it does best.

 

by: jajjonesPosted on 2005-09-22 at 07:16:53ID: 14936890

Aplogies if I get this wrong, but what it would look like is:



                           E3 Pri                                E3 Sec
                             l                                          l
                          BGP                                     BGP
                            l                                           l
                       7206 WAN                             7206 WAN
                       7206 LAN                              7206 LAN
                           l                                             l
                        192.168.1.2/29                  192.168.1.3/29
                           l                                            l
                         ----------------OSPF------------------
                                                l
                                                l
                                   192.168.1.1/29
                                 3750 Gi1/0/1 (eg)
                                 3750 VLAN 100
                                 10.108.8.1/24 (eg)


Is this right ???????  

,

 

by: lrmoorePosted on 2005-09-22 at 10:36:19ID: 14938750

Pretty close, yep....

                          E3 Pri                                E3 Sec
                            l                                          l
                          BGP                                     BGP
                            l                                          l
                       <public IP>                           <public IP>
                       7206 WAN                             7206 WAN
                       7206 LAN                               7206 LAN
                           l                                             l
                        192.168.1.2/29                  192.168.1.3/29
                           l                                             l
                         ----------------OSPF------------------
                                                l
                                 3750 VLAN1 (eg)
                                     192.168.1.4/24
                                       (both routers' LAN ports in same VLAN)
                                 3750 VLAN 100
                                     10.108.8.1/24 (eg)

Following is example configs:

R1 Primary
ip route 0.0.0.0 0.0.0.0 <upstream IP>
 router bgp <asn>
   neighbor a.b.c.d <asn>
 router ospf 100
   network 192.168.1.0 0.0.0.255 area 0
   default-information originate

R2 Secondary
ip route 0.0.0.0 0.0.0.0 <upstream IP>
 router bgp <asn>
   neighbor a.b.c.d <asn>
 router ospf 100
   network 192.168.1.0 0.0.0.255 area 0
   default-information originate

C3750
 router ospf 100
   network 192.168.1.0 0.0.0.255 area 0
   redistribute connected subnets

Given this config, each router will automatically learn the switch's VLAN subnets, and the switch will learn 2 equal-cost paths to a default route. If either E3 is down, the default route will drop out and the 3750 is left with only one default.

Q: What are you doing about NAT/Firewall? I'm assuming that you have a firewall and that these servers will have to either have public IP's or be nat'ed with public IP's on the routers or firewall...

 

by: jajjonesPosted on 2005-09-22 at 13:25:05ID: 14940124

Thanks for the clarification and sample configs.
The DC is owned by the same company that will be providing the MPLS backbone - to all intent and purposes a private network.  I  will be setting up ACLs on the 7200.
Thanks for your help.  Enjoy the points dude :-))))

JAJ

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