Migrating irf links 40gig to 10gig

[kimsj]

Hello

We currently have 2 FF 5700-40XG-2QSFP+ running in production.

these are currenly utilizing the two 40gig interfaces as IRF link. We are trying to figure out a way to move the IRF from the 2x40Gig interfaces to 4x10Gig interfaces.

How could this be accomplished without creating service disuption.

Plan 1.

We thought about just adding one of the 10Gig links to the current IRF link, tho we do not know if IRF supports mixed link speeds. And then remove the 40Gig links from the IRF, and last adding the remaining 3 Ten gig links to the IRF.

We can't figure out if this is actually supported?

Plan 2

We also thought about creating a second IRF link consisting of the 4x10links, connect it, and then removing the 40Gig IRF link. Would the second IRF link pickup the slack. And is there anything we should be aware of, any form of loop or something with this plan.

[Ivan_B · Accepted solution]

Hello @kimsj !

Plan 1 is the plan to go. 10G SFP+ ports in this model are grouped into groups of 4 ports - group 1 contains ports */0/1 - */0/4, group 2 contains ports */0/5 - */0/8 etc. 

When you use the SFP+ ports as IRF physical interfaces, follow these restrictions and guidelines:
• If you use one port in a group for IRF links, you must also use all the other ports in the group for IRF links. However, you can bind the ports to different IRF ports.
• Before you bind an SFP+ port to an IRF port or remove it from the IRF port, you must shut down all the SFP+ ports in the same group.
• Bring up the ports after you complete the operation.

Taking this information into account:

- Select one port group which 4 ports will be physical IRF ports 
- Delete all configuration from those ports ("default" command in the port's context)
- Shut them down
- Add them to logical existing irf-ports ("port group interface ..." in the irf-port context).
- Wire up those ports and bring them up (undo shutdown).
- Check if newly added ports are operational as IRF physical ports ("display irf link", Status should be "UP").
- Shut down 40G IRF physical ports.
- Remove them from logical irf-ports ("undo port group interface <40g_interface_number>" in the context of respective "irf-port").
- Remove transceivers and/or cables from the 40G ports.

That should be it.

[kimsj]

alright so add

irf-port1/1

port group interface Ten-GigabitEthernet1/0/37

port group interface Ten-GigabitEthernet1/0/38

port group interface Ten-GigabitEthernet1/0/39

port group interface Ten-GigabitEthernet1/0/40

irf-port2/2

port group interface Ten-GigabitEthernet2/0/37

port group interface Ten-GigabitEthernet2/0/38

port group interface Ten-GigabitEthernet2/0/39

port group interface Ten-GigabitEthernet2/0/40

wire up, and bring up.

after that remove

irf-port1/1

undo port group interface FortyGigE1/0/41

undo port group interface FortyGigE1/0/42

and so forth

How about wiring the 10gig, something like this

Ten-GigabitEthernet1/0/37 -> Ten-GigabitEthernet2/0/38

Ten-GigabitEthernet1/0/38 -> Ten-GigabitEthernet2/0/39

Ten-GigabitEthernet1/0/39 -> Ten-GigabitEthernet2/0/40

Ten-GigabitEthernet1/0/40 -> Ten-GigabitEthernet2/0/37

[Ivan_B]

There is a simple rule - physical port member of logical irf-port 1/1 should be connected to another physical port member of logical irf-port 2/2. Or irf-port1/2 to irf-port 2/1. So this cross connection is important when we speak about logical irf-ports.

Physical connectivity can be as simple as this:

Ten-GigabitEthernet1/0/37 -> Ten-GigabitEthernet2/0/37
Ten-GigabitEthernet1/0/38 -> Ten-GigabitEthernet2/0/38
Ten-GigabitEthernet1/0/39 -> Ten-GigabitEthernet2/0/39
Ten-GigabitEthernet1/0/40 -> Ten-GigabitEthernet2/0/40

as long as all XGE1/0/37-40 are members of irf-port 1/1 and all XGE2/0/37-40 are members of irf-port 2/2.

[kimsj]

Thank you for your assistance, ill go forward with the plan then