03-26-2013 01:27 AM - edited 03-07-2019 12:28 PM
Hi All
i have 2 no of 3560G in our core, now my requirement is to establish the redunent network like for the edge 2960G
using stack or some other way ...
Thanks
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03-26-2013 03:19 PM
In this case 2 one is not an issue , but only thing is the Stack Configuration at Core
You cannot stack either the 3560G or the 2960G.
Only the 2960S, 3750 and 3850 can be stacked to form one logical switch chassis.
03-26-2013 01:38 AM
03-26-2013 04:23 AM
thnk for your reply
My design is such. I use Cisco 2960G's and 3560G's at my access layer. To route between the VLANs I use the 3560G's.
In this case 2 one is not an issue , but only thing is the Stack Configuration at Core
03-26-2013 03:19 PM
In this case 2 one is not an issue , but only thing is the Stack Configuration at Core
You cannot stack either the 3560G or the 2960G.
Only the 2960S, 3750 and 3850 can be stacked to form one logical switch chassis.
03-30-2013 12:44 AM
hi
instead of this stack
how make the redunency in core using two number of 3560G
03-30-2013 03:30 AM
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instead of this stackhow make the redunency in core using two number of 3560G
Minimally, you run a link from each edge L2 switch to each L3 switch. If you have the same VLAN across multiple edge switches, you'll have L2 loops, for which you'll need STP to logically keep from forming. (As a rule you normally want STP enabled.) You'll also want to set root bridge to be primary on one L3 switch and secondary on the other L3 switch.
Then you run HSRP on the (3560G) L3 switches.
Normally you also run a link between the two L3 switches. This link might be just L3 or it might be L2 (L2 cross connect provides another L2 redundant path - often done to insure L2 between the two L3s.) With the L2 cross connect (often a trunk), you'll need to consider L2 traffic flows between the HSRP GW and return traffic. Also normally you treat one L3 as the hot for all traffic and the secondary as a warm standby, but you can also, but using HSRP priorities and STP root priorities, load balance VLANs across the two L3 cores. (Some platforms also support GLBP, but the 3560s do not.)
When working with two L3 switches, it's possible to run into unicast flooding. This can be avoided by design and/or mitigate by insuring the ARP and MAC table timers are the same.
03-26-2013 05:32 AM
Hello,
When you connect the switches via the stack cables and when they power up the switches will go into a switch election to elect who will be master. Once this is done and the switches are in the stack, then it's recommended to set priorities to know which switch is the master.
More information can be found here:
http://www.cisco.com/en/US/products/hw/switches/ps5023/products_configuration_example09186a00807811ad.shtml
Make sure you refer to the cabling considerations for building a stack:
http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/hardware/installation/guide/HIGINSTL.html#wp1151513
Hope this helps.
Dave
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