Configuring SMLT parameters for SPBM

Use the following procedure to configure the required Split MultiLink Trunking (SMLT) parameters to allow SPBM to interoperate with SMLT on the switch.

Note

The assignment of primary and secondary roles to the vIST peers is automatic. The switch with the lower system ID (between the two vIST peers) is primary, and the switch with the higher system ID is secondary when default system-id values are being used.
SMLT peer system ID is part of the required configuration. You must configure the SMLT peer system ID as the nodal MAC of the peer device. In the IS-IS network, the nodal MAC of devices should be eight apart from each other.
When using the default hardware assigned system-id value, the SMLT Virtual BMAC is automatically derived by comparing the system-id values of the two vIST peers. A value of 0x01 plus the lower of the two system-id values is used as the SMLT Virtual BMAC.

When using a manually configured system-id value, the SMLT Virtual BMAC must also be manually configured.
An I-SID must be assigned to every VLAN that is a member of a Layer 2 VSN. Also, if a Layer 2 VSN is created on one vIST Peer, it must also be created on the other vIST peer.

Procedure

Enter Global Configuration mode:

enable

configure terminal
Disable IS-IS on the switch:

no router isis enable
Enter IS-IS Router Configuration mode:

enable

configure terminal

router isis
Specify the system ID of the vIST peer, so that if it goes down, the local peer can take over forwarding for the failed peer:

spbm <1–100> smlt-peer—system—id <xxxx.xxxx.xxxx>
Configure the virtual B-MAC, which is shared and advertised by both peers:

spbm <1–100> smlt-virtual-bmac <0x00:0x00:0x00:0x00:0x00:0x00>
Exit to Global Configuration mode:

exit
Enable IS-IS on the switch:

router isis enable
Display the SPBM SMLT configuration:

show isis spbm

Example

Switch:1>enable
Switch:1#configure terminal

Disable IS-IS on the switch:

Switch:1(config)#no router isis enable

Enter the IS-IS Router Configuration mode:

Switch:1(config)#router isis
Switch:1(config-isis)#spbm 1 smlt-peer-system-id 0018.b0bb.b3df
Switch:1(config-isis)#spbm 1 smlt-virtual-bmac 00:14:c7:e1:33:e0
Switch:1(config-isis)#router isis enable

Switch:1(config-isis)#show isis spbm
==============================================================================================================
                                                ISIS SPBM Info
==============================================================================================================
SPBM       B-VID      PRIMARY    NICK     LSDB     IP       IPV6     MULTICAST  SPB-PIM-GW         STP-MULTI 
INSTANCE              VLAN       NAME     TRAP                                                     HOMING 
--------------------------------------------------------------------------------------------------------------
1          4051-4052  4051                disable  disable  disable  enable     disable            enable  

==============================================================================================================
                                             ISIS SPBM SMLT Info
==============================================================================================================
SPBM       SMLT-SPLIT-BEB       SMLT-VIRTUAL-BMAC     SMLT-PEER-SYSTEM-ID
INSTANCE  
--------------------------------------------------------------------------------------------------------------
1          primary              00:00:00:00:00:00                        


--------------------------------------------------------------------------------
Total Num of SPBM instances: 1
--------------------------------------------------------------------------------

Variable definitions

The following table defines parameters for the spbm command.


Variable	Value
smlt-peer-system-id `<xxxx.xxxx.xxxx>`	Specifies the IS-IS SPBM peer system ID. SMLT peer system ID is part of the required configuration. You must configure the SMLT peer system ID as the nodal MAC of the peer device. In the IS-IS network, the nodal MAC of devices should be eight apart from each other.
smlt-virtual-bmac `<0x00:0x00:0x00:0x00:0x00:0x00>`	Specifies a virtual MAC address that can be used by both peers. SMLT virtual B-MAC is an optional configuration. Note: If SMLT virtual B-MAC is not configured, the system derives SMLT virtual B-MAC from the configured SMLT peer system ID and the nodal MAC of the device (IS-IS system ID). The system compares the nodal MAC of the device with the SMLT peer system ID configured and takes the small one, plus 0x01, as the SMLT virtual B-MAC. The system also derives SMLT split BEB from the SMLT peer system ID and nodal MAC of the device. The device with the lower system ID is primary, the device with the higher system ID is secondary.