06-18-2019 03:52 AM
All,
I have a project to replace an existing collapsed core/distribution & access layer, currently in a single stack.
Core/Dist is 2x3750-12S.
Access layer consists of 4 x 48 port switches, with a requirement to add another.
I want to split the core/distribution layer into it's own stack firstly - probably 2x3850-24S
Client wants 1G to user ports.
Question is how would you best configure the uplinks and access switches - as a single stack, single switches, multiple stacks?
Regards.
Solved! Go to Solution.
06-18-2019 08:08 AM - edited 06-18-2019 08:09 AM
Yes thats why its a good idea to use 10GB uplink modules between access and dist if possible , the modules are not dear on a 9k as an extra but remember too not all ports will be firing at the same time , if these are just access users you should be ok but if you putting servers in access layer too then may have an issue with oversubscription
10 links may bit overkill if thats what your thinking , 2 POs definitely would be as only 1 PO can be active at a time , the second 1 will automatically go into blocking mode at layer 2 to prevent a loop
my opinion would be a 3gb -5gb link between the dist and access would do fine if just users at the access layer , they wont all be sending traffic at once and if required you can push up to 8 links in a PO and increase it , you can get all links in a PO to send traffic and increase overall bandwidth between the 2 sets of stacks
explains LB on etherchannel
https://www.cisco.com/c/en/us/support/docs/lan-switching/etherchannel/12023-4.html
06-18-2019 04:54 AM
06-18-2019 05:55 AM
06-18-2019 06:39 AM
06-18-2019 07:29 AM
06-18-2019 07:51 AM
06-18-2019 08:08 AM - edited 06-18-2019 08:09 AM
Yes thats why its a good idea to use 10GB uplink modules between access and dist if possible , the modules are not dear on a 9k as an extra but remember too not all ports will be firing at the same time , if these are just access users you should be ok but if you putting servers in access layer too then may have an issue with oversubscription
10 links may bit overkill if thats what your thinking , 2 POs definitely would be as only 1 PO can be active at a time , the second 1 will automatically go into blocking mode at layer 2 to prevent a loop
my opinion would be a 3gb -5gb link between the dist and access would do fine if just users at the access layer , they wont all be sending traffic at once and if required you can push up to 8 links in a PO and increase it , you can get all links in a PO to send traffic and increase overall bandwidth between the 2 sets of stacks
explains LB on etherchannel
https://www.cisco.com/c/en/us/support/docs/lan-switching/etherchannel/12023-4.html
06-18-2019 08:28 AM
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