Configure RSMLT on a VLAN

Configure RSMLT on a VLAN to exchange Layer 3 information between peer nodes in a switch cluster. This configuration applies to both IPv4 and IPv6.

Before you begin

An IP routing protocol is enabled on VLAN Layer 3 interfaces.
VLANs with Layer 3 interfaces participate in Split MultiLink Trunking (SMLT).

About this task

The VLAN can be either IPv4 or IPv6, or both. RSMLT configuration on a VLAN simultaneously affects both IPv4 and IPv6. By default, RSMLT is disabled on a VLAN.

Procedure

Enter VLAN Interface Configuration mode:

enable

configure terminal

interface vlan <1–4059>
Configure the holddown timer:

ip rsmlt holddown-timer <0-3600>
Configure the holdup timer:

ip rsmlt holdup-timer <0-9999>
Enable RSMLT on the VLAN:

ip rsmlt

Example

Configure and enable RSMLT on a VLAN:

Switch:1>enable
Switch:1#configure terminal
Switch:1(config)#interface vlan 100
Switch:1(config-if)#ip rsmlt holddown-timer 100
Switch:1(config-if)#ip rsmlt holdup-timer 200
Switch:1(config-if)#ip rsmlt

Variable Definitions

The following table defines parameters for the ip rsmlt command.


Variable	Value
holddown-timer `<0-3600>`	Defines how long the recovering or restarting system remains in a non-Layer 3 forwarding mode for the peer router MAC address. The default is 60. Configure this value to be longer than the anticipated routing protocol convergence. If you disable RSMLT on a VLAN, non default values for this variable do not save across restarts.
holdup-timer `<0-3600\|9999>`	Defines how long the RSMLT system maintains forwarding for its peer. The value is a range from 0 to 3600 seconds or 9999. 9999 means infinity. The default is 1800. If you disable RSMLT on a VLAN, non default values for this variable do not save across restarts.

The following table defines parameters for the interface command.


Variable	Value
`<1-4059>`	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.