Redundancy and Load balancing on Cisco 3650s

Hi All,
            We have 2 3650 switches say SWITCH X and SWITCH Y in one site Dallas and 2 3650 in another site say SWITCH P and SWITCH Q in Tokyo and 2 3650 in a third site say SWITCH W and SWITCH Z in New York, each site will be configured with HSRP and multiple LANS/VLANS at the back. Sites are connected via leased lines and inter-site communication is done via OSPF  is it possible for HSRP and GLBP to coexist? We would like both switches to be routing at the same time say SWITCH X sending packets to Tokyo while SWITCH Y sends packets to New York, this should apply for all 3 sites. My understanding of HSRP is that only 1 unit is actively routing at a time and we would like both units sending packets depending on the destination address, do we need a special configuration for this setup bearing in mind the leased lines are going to be directly plugged into 3650s.
sigmiteAsked:
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Don JohnstonInstructorCommented:
You could do it with HSRP by creating multiple groups at each site, but GLBP would accomplish the same thing by default.

I'd go with GLBP.
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sigmiteAuthor Commented:
Thanks for your comment
I assume 2 groups would needed - if so can you explain how the active-active routing can be done using HSRP (maybe a sample config). Also you did not comment on HSRP and GLBP co-existing.
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Don JohnstonInstructorCommented:
First, you wouldn't want HSRP and GLBP. They both do the same thing (although GLBP does it better). They can co-exist, I just don't know why you would want to.

In the example below, R1 will be the active router for group 1 and R2 will be active for group 2.

Half of the users will have R1 as their default-gateway and the other have will use Router 2.



R1:
int f0/0
 ip address 192.168.1.1 255.255.255.0
 standby 1 ip 192.168.1.10
 standby 1 priority 150
 standby 1 preempt
 standby 2 ip 192.168.1.20
 standby 2 priority 100
 standby 2 preempt
 
 
R2:
int f0/0
 ip address 192.168.1.2 255.255.255.0
 standby 1 ip 192.168.1.10
 standby 1 priority 100
 standby 1 preempt
 standby 2 ip 192.168.1.20
 standby 2 priority 150
 standby 2 preempt

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sigmiteAuthor Commented:
Thanks once again for your comment and i appreciate your time. Let me explain further

Based on my initial scenario let's say Dallas has a subnet of 192.168.10.0/24, New York has 192.168.11.0/24 and Tokyo has 192.168.12.0/24, now let us take Dallas as the source of the traffic, SWITCH X and SWITCH Y are running HSRP, SWITCH X has a physical connection to New York and SWITCH Y a physical connection Tokyo. According to your configuration above all users pointing to SWITCH X as default gateway will be able to communicate with New York, and all users pointing to SWITCH Y as default gateway will be able to communicate with Tokyo - I may be wrong but that is my interpretation of your config above. We would like to all users to be able to communicate with New York and Tokyo irrespective of the default gateway i.e. Trafiic destined for 192.168.11.0/24 should go through SWITCH X and traffic destined for 192.168.12.0/24 should go through SWITCH Y - can this be achieved using your design above?
 
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Don JohnstonInstructorCommented:
The path to the destination will determined by the routing table in each router (either static routes or routing protocol).

If Dallas - Tokyo traffic is handled by X, then X's routing table will cause the packets to be forwarded over to Y.

To keep the traffic from being sent back over the 10.0 network, you could put a link between X and Y for that traffic.
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diepesCommented:
How fast is the leased lines ?

Will the GW on the switch be the bottleneck
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sigmiteAuthor Commented:
Dallas, New York and Tokyo will be running OSPF externally over the leased lines. Are you saying that X and Y (HSRP PAIR)should be running OSPF internally as well to exchange routes? Links will be 20Mbps across sites.
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Don JohnstonInstructorCommented:
No, they don't HAVE to run a routing protocol. They must have routes to all the networks in their routing tables. How those routes get there (static vs. routing protocol) is up to you.
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sigmiteAuthor Commented:
I completely agree that they must have routes to all networks in their routing table, assuming  static routes are used if SWITCH X goes down then SWITCH Y will continue to send packets across to SWITCH X not knowing it's gone down thereby loosing redundancy. My understanding is that even though HSRP will kick in it will not stop SWITCH Y from sending packets to the fialed device (SWITCH X). My aim is to make sure that SWITCH X and SWITCH Y have identical routing tables at the same maintaining redundancy using HSRP. Have you implemented this solution before - if yes how did you achieve redundancy with 2 devices connecting to 2 different links at each site?
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Don JohnstonInstructorCommented:
>My aim is to make sure that SWITCH X and SWITCH Y have identical routing tables at the same maintaining redundancy using HSRP.

Then you need a routing protocol (like OSPF).
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sigmiteAuthor Commented:
Thanks Don
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