Implementing REP

[Rafael Jimenez]

I have a metro ethernet ring with 13 ME swithces in production with spaning tree. I want implement REP. What is the best way to configure the REP Ports, in order to have the less amount of network interruptions  ?

[silvio.lui]

Hi Rafael,

When you active the REP, automaticaly STP will be disable on the interface that are included in the segment.

Try this:

1 - Select that will be the Edge Switch in the ring and shut one interface to avoid loop;

2 - Select a VLAN Admin tha will be used by REP and config in all trunks segment ring;

    Ex:  rep vlan admin

3 - Config the all REP Transit Switches;

     Ex: int giga0/1

              rep segment 1

           int giga0/2

              rep segment 1

4 - Config the Edge Switch:

     Ex: int giga0/1

              shutdown

              rep segment 1 edge primary

           int gia0/2

              rep segment 1 edge

5 - Verify if the REP topology will be created, and the port that be shutdown is in Fail:

      Ex: show rep topology

REP Segment 1
Warning: 

REP detects a segment failure, topology may be incomplete

BridgeName       PortName   Edge Role
---------------- ---------- ---- ----
ME_EDGE             Gi0/1          Fail
ME_EDGE             Gi0/2          Open
ME_TRANST           Gi0/2          Open

ME_TRANST           Gi0/1     Sec  Open

6 - Return to UP the shutdown port, and verify de topology again:

REP Segment 1
BridgeName       PortName   Edge Role
---------------- ---------- ---- ----
ME_EDGE             Gi0/1     Pri  Open
ME_EDGE             Gi0/2          Open
ME_TRANST           Gi0/2          Open

ME_TRANST           Gi0/1     Sec  Alt

*** the 'Alt' status is the port in block mode to avoid loop.

I hope help!

Regards!

Silvio L. Veira

[Rafael Jimenez]

Thanks Silvio,

My main concern is what will happen when I run the first command rep segment 1 in the first interface, there will be a network outage? for how long ?

What will happen when I configure the transit switches with the rep segment 1,  there will be a network outage? for how long ?

What happens when I type the command rep block port preferred vlan all on edge primary,  there will be a network outage? for how long ?

What is the risk and the best way to avoid loss conectivity to my telnet session?