Configuration Guide

Table Of Contents
©2021 Extreme Networks, Inc. All rights reserved
October 2021
51
8.8
Migrating a VLAN to an L2 VSN
The following procedure can be used to provide L2 connectivity for a VLAN across the SPB core.
Follow the pre-migration procedures checks described in the section “Common Procedures and
Exclusions on Migration”
Identify the UNI and NNI ports that are currently port members of the VLAN on all the switches in
the network.
On all the switches in the network which are currently connected by the VLAN – remove the NNI
ports from the membership list of the VLAN. This step will cause service interruption.
Make the VLAN an L2VSN using the “vlan <vlan id> ISID <isid value>” ACLI command. Use the
same value of ISID on all the switches. This step should restore service.
SMLT deployment
o
For the ERS 8800 & VSP 7000, the L2VSN VLAN cannot be a member of the IST. An
error message will be recorded and logged if you try to add VLAN to the IST MLT
instance
o
For the VSP 9000, the L2VSN VLAN must be a member of the IST. A warning message
to this effect will always be displayed when an ISID is assigned to a VLAN.
o
For a vIST, for the L2VSN C-VLAN, only the local SMLT ports are added. There is no
physical IST as the vIST is virtualized.
8.8.1
Migrating to Inter VSN Routing
Inter VSN provides the ability to route traffic between extended VLANs where the VLANs have different
ISIDs. All of the traditional IPv4 unicast routing and gateway redundancy protocols (OSPF, RIP, BGP,
VRRP, RSMLT etc) are supported on top of any VLAN that is mapped to an ISID. Please note that RSMLT
will only work if the switches acting as redundant gateways are IST connected together.
Currently the only protocols which will not work on an IP interface assigned to a L2VSN VLAN are the
following:
VSP 4000, VSP 7200, VSP 8000
o
IPv6 multicast routing (MLD)
o
IPv4 multicast routing (IGMP, PIM-SM, PIM-SSM)
VSP 9000, ERS 8800
IPv6 unicast & multicast routing (OSPFv3, MLD)
IPv4 multicast routing (IGMP, PIM-SM, PIM-SSM)
Please note that RSMLT will only work if the switches acting as redundant gateways are IST connected
together.
The high level procedure to migrate a configuration to use Inter-ISID routing is described below.
Follow the pre-migration procedures checks described in the section “Common Procedures and
Exclusions on Migration”
For each VLAN in the SPB core
o
On all the switches where the VLAN is configured - remove all NNI ports
This will cause service interruption.