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Redundancy for different network

Right now I am using one router to connect all the different private IP networks in my company but now I want to use two layer 3 switches like CIsco ME 3400 for my network for redundancy Is it possible ?? I have different private network like 10.10.11.0/24 . 10.10.12.0/24 and 10.10.13.0/24 IP connected throught router but can I use two layer 3 switches and connect this same private IP network with one another for redundancy. Please suggest what will be the best solution .Thank you for your help.

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Accepted Solutions
Hall of Fame Super Blue

Re: Redundancy for different network

ratotopii wrote:

Right now I am using one router to connect all the different private IP networks in my company but now I want to use two layer 3 switches like CIsco ME 3400 for my network for redundancy Is it possible ?? I have different private network like 10.10.11.0/24 . 10.10.12.0/24 and 10.10.13.0/24 IP connected throught router but can I use two layer 3 switches and connect this same private IP network with one another for redundancy. Please suggest what will be the best solution .Thank you for your help.

Yes it's possible. You would connect the 2 switches together with a L2 trunk and then on each switch create your vlans then use HSRP for redundancy eg.

using 10.10.13.0/24 as an example

ME1

switch(config)# vlan 10

switch(config)# int vlan 10

switch(config-if)# ip address 10.10.13.2 255.255.255.0

switch(config-if)# standby 10 ip 10.10.13.1

switch(config-if)# standby 10 priority 110

switch(config-if)# standby 10 preempt

switch(config-if)# standby 10 authentication

ME2

switch(config)# vlan 10

switch(config)# int vlan 10

switch(config-if)# ip address 10.10.13.3 255.255.255.0

switch(config-if)# standby 10 ip 10.10.13.1

switch(config-if)# standby 10 authentication

All clients in vlan 10 should use 10.10.13.1 as their default-gateway. In the above example ME1 is the HSRP active. You can make ME1 HSRP active for all vlans or you can make ME2 active for some so you get a rudimentary load-balancing.

Don't forget the switches need connecting together with a L2 trunk allowing all your vlans on it.

One last point - why ME3400 switches ? These are very specific service provider access switches. If you just want a general L3 switch i would go with the 3560 or the 3750.

Jon

4 REPLIES
Hall of Fame Super Blue

Re: Redundancy for different network

ratotopii wrote:

Right now I am using one router to connect all the different private IP networks in my company but now I want to use two layer 3 switches like CIsco ME 3400 for my network for redundancy Is it possible ?? I have different private network like 10.10.11.0/24 . 10.10.12.0/24 and 10.10.13.0/24 IP connected throught router but can I use two layer 3 switches and connect this same private IP network with one another for redundancy. Please suggest what will be the best solution .Thank you for your help.

Yes it's possible. You would connect the 2 switches together with a L2 trunk and then on each switch create your vlans then use HSRP for redundancy eg.

using 10.10.13.0/24 as an example

ME1

switch(config)# vlan 10

switch(config)# int vlan 10

switch(config-if)# ip address 10.10.13.2 255.255.255.0

switch(config-if)# standby 10 ip 10.10.13.1

switch(config-if)# standby 10 priority 110

switch(config-if)# standby 10 preempt

switch(config-if)# standby 10 authentication

ME2

switch(config)# vlan 10

switch(config)# int vlan 10

switch(config-if)# ip address 10.10.13.3 255.255.255.0

switch(config-if)# standby 10 ip 10.10.13.1

switch(config-if)# standby 10 authentication

All clients in vlan 10 should use 10.10.13.1 as their default-gateway. In the above example ME1 is the HSRP active. You can make ME1 HSRP active for all vlans or you can make ME2 active for some so you get a rudimentary load-balancing.

Don't forget the switches need connecting together with a L2 trunk allowing all your vlans on it.

One last point - why ME3400 switches ? These are very specific service provider access switches. If you just want a general L3 switch i would go with the 3560 or the 3750.

Jon

Community Member

Re: Redundancy for different network

Thank you  Jon

I will test the configuration

Community Member

Re: Redundancy for different network

Hi Jon

I did as you have written and it worked but when i created another VLAN 20 with network 10.10.12.0/24  as you have written, I was able to ping between different network PC with IP 10.10.12.253 and 10.10.13.253 if the vlan was created in primary switch but if i create a vlan in secondary switch it will not even ping a same network floating IP, is there a way to solve this problem.

Hall of Fame Super Blue

Re: Redundancy for different network

That doesn't sound right. Can you post -

1) "sh vlan brief" from both switches

2) "sh ip int brief" from both switches

3) config of both switches

Jon

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