Configure SPBM Layer 2 VSN

SPBM supports Layer 2 Virtual Service Network (VSN) functionality where customer VLANs (C-VLANs) are bridged over the SPBM core infrastructure.

At the BEBs, customer VLANs (C-VLAN) are mapped to I-SIDs based on the local service provisioning. Outgoing frames are encapsulated in a MAC-in-MAC header, and then forwarded across the core to the far-end BEB, which strips off the encapsulation and forwards the frame to the destination network based on the I-SID-to-C-VLAN provisioning.

Before you begin

You must configure the required SPBM and IS-IS infrastructure, which includes the creation of SPBM B-VLANs.
You must create the customer VLANs (C-VLANs) and add slots/ports.

Procedure

Enter Global Configuration mode:

enable

configure terminal
Map a customer VLAN (C-VLAN) to a Service Instance Identifier (I-SID):

vlan i-sid <1-4059> <0–16777215> [force]

Important

When a protocol VLAN is created, all ports are added to the VLAN including SPBM ports. To configure a protocol-based VLAN as a C-VLAN, you must first remove the SPBM-enabled ports from the protocol based VLAN, and then configure the protocol-based VLAN as a C-VLAN.

The switch reserves I-SID 0x00ffffff. The switch uses this I-SID to advertise the virtual B-MAC in an SMLT dual-homing environment. The platform clears the receive and transmit bit of this I-SID, therefore I-SID 0x00ffffff cannot be used for any other service.
Display C-VLAN information:

show vlan i-sid

Example

Switch:1>enable
Switch:1#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Switch:1(config)#vlan i-sid 10 100
Switch:1(config)#show vlan i-sid

Switch:1>show vlan i-sid
===============================================================================
                   Vlan I-SID
===============================================================================
VLAN_ID      I-SID        I-SID NAME        
-------------------------------------------------------------------------------
1                             
10           100          Hospital-Server-10                 
90           1000         ISID-1000        

3 out of 3 Total Num of Vlans displayed

Variable Definitions

The following table defines parameters for the vlan i-sid command.


Variable	Value
`<1-4059>`	Specifies the primary VLAN ID. Specifies the VLAN ID in the range of 1 to 4059. By default, VLAN IDs 1 to 4059 are configurable and the system reserves VLAN IDs 4060 to 4094 for internal use. On switches that support the vrf-scaling and spbm-config-mode boot configuration flags, if you enable these flags, the system also reserves VLAN IDs 3500 to 3998. VLAN ID 1 is the default VLAN and you cannot create or delete VLAN ID 1.
`<0-16777215>`	Specifies the service instance identifier (I-SID). Note: The switch reserves I-SID 0x00ffffff. The switch uses this I-SID to advertise the virtual B-MAC in an SMLT dual-homing environment. The platform clears the receive and transmit bit of this I-SID, therefore I-SID 0x00ffffff cannot be used for any other service. This value is the same for the primary and secondary VLANs. Note: When you add or remove an I-SID on a VLAN IP interface for 5520 Series5720 Series, the switch disables and enables routing on the VLAN interface.
force	Specifies the software must replace the existing VLAN-to-I-SID mapping, if one exists.