09-14-2016 07:17 AM - edited 03-08-2019 07:25 AM
We are in the midst of migrating our core infrastructure from four Cat6500s to two Nexus 7Ks with 5Ks.
One of the tasks I am charged with is migrating that STP roots for all of our VLANS from our Cat to our Nexus7K, in addition to migrating the hsrp active & standby routers for all of our vlan interfaces from the 4 Cats to the two Nexus 7Ks.
I'm looking to this community for a bit of guidance and some suggestions on how best to accomplish this, with minimal interruption to service, as we are a large, regional healthcare provider.
It should be noted that we have a large number of vlans (and vlan interfaces) in use that must be moved. To date, we have implemented RSTP on the Nexus side of our infrastructure, but the Cat side (where the STP root is for most VLANS) still uses PVST+. Currently, most of our edge devices now connect physically to the Nexus side of our network. However, most of our servers (on a few vlans) are still connected to the Cats.
Some specific questions I have are:
Any suggestions are greatly appreciated.
Thank you in advance.
John
09-19-2016 01:02 AM
- Normally it shouldn't be too difficult to do this; as per STP root makes sure that the VPC
nex-peer becomes the second in prio , after the current highest (the cat...) ; same for hsrp; configure
the nex-pair as 3th in priority so that they are defaulting to primary once the catxxx is turned off.
Vlan's should be defined 'from the cat6pair' and active; then the switch to vtp master can also be easily made. This is theoretically.
Personally I would prefer to this with help from my cisco partner or reseller as unknown gotcha's can still happen, especially I would do it this way if your environment is 'production-critical'.
M.
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