Configure SPBM IPv4 Shortcuts

Before you begin

  • Configure the required SPBM and IS-IS infrastructure, which includes the creation of SPBM B-VLANs.

  • Before redistributing routes into IS-IS, create the Customer VLANs, add slots/ports, and add the IP addresses and network masks.

About this task

To enable IP shortcuts on the BEBs, you can configure a circuitless IP (CLIP) address (loopback address), and specify this address as the IS-IS source address. This source address is automatically advertised into IS-IS using TLV 135. In addition, to advertise routes from the BEBs into the SPBM network, you must enable route redistribution of direct and static routes into IS-IS.

Note

Note

The loopback address on each switch or BEB must all be in different subnets to ensure connectivity between them. To do this, use a 32-bit mask with the CLIP address.

Procedure

  1. Enter Loopback Interface Configuration mode

    enable

    configure terminal

    interface Loopback <1-256>

  2. Configure a CLIP interface to use as the source address for SPBM IP shortcuts:

    ip address [<1-256>] <A.B.C.D/X>

  3. Exit the Loopback Interface Configuration mode to Global Configuration mode:

    exit

  4. Log on to IS-IS Router Configuration mode:

    router isis

  5. Specify the CLIP interface as the source address for SPBM IP shortcuts:

    ip-source-address <A.B.C.D>

  6. Configure SPBM IP shortcuts:

    spbm <1–100> ip enable

  7. Display the status of SPBM IP shortcuts on the switch:

    show isis spbm

  8. Identify routes on the local switch to be announced into the SPBM network:

    redistribute {bgp | direct | ospf | rip | static}

  9. Optional: Tag routes that BGP or OSPF redistribute into IS-IS:
    redistribute {bgp | ospf} tag <1-4294967295>
  10. Enable routes to be announced into the SPBM network

    redistribute {bgp | direct | ospf | rip | static} enable

  11. Exit to Global Configuration mode:

    exit

  12. Apply the configured redistribution:

    isis apply redistribute {bgp | direct | ospf | rip | static | vrf WORD<1-16>}

Example

Switch:1>enable
Switch:1#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Switch:1(config)#interface loopback 1
Switch:1(config-if)#ip address 192.0.2.2/8
Switch:1(config-if)#exit
Switch:1(config)#router isis
Switch:1(config-isis)#ip-source-address 192.0.2.2
Switch:1(config-isis)#spbm 1 ip enable
Switch:1(config-isis)#show isis spbm

================================================================================
                                 ISIS SPBM Info
================================================================================
SPBM       B-VID      PRIMARY    NICK     LSDB     IP       IPV6     MULTICAST
INSTANCE              VLAN       NAME     TRAP
--------------------------------------------------------------------------------
1          4086-4087  4086       3.03.01  disable  enable  enable  disable

================================================================================
                              ISIS SPBM SMLT Info
================================================================================
SPBM       SMLT-SPLIT-BEB       SMLT-VIRTUAL-BMAC     SMLT-PEER-SYSTEM-ID
INSTANCE
--------------------------------------------------------------------------------
1          primary              00:00:03:03:03:03    0000.0303.0302


--------------------------------------------------------------------------------
 Total Num of SPBM instances: 1
--------------------------------------------------------------------------------
Switch:1(config-isis)#redistribute rip
Switch:1(config-isis)#redistribute rip enable
Switch:1(config-isis)#exit
Switch:1(config)#isis apply redistribute rip

Variable Definitions

The following table defines parameters for the ip address command.

Variable

Value

<1–256>

Specifies an interface ID value. This value is optional.

<A.B.C.D/X>

Specifies an IP address and subnet mask. Use the no option to delete the specified IP address.

<A.B.C.D>

Specifies an IP address. Use the no option to delete the specified IP address.

The following table defines parameters for the ip-source-address command.

Variable

Value

<A.B.C.D>

Specifies the CLIP interface to use as the source address for SPBM IP shortcuts.

The following table defines parameters for the spbm command.

Variable

Value

<1–100> ip enable

Enables or disables SPBM IP shortcut state.

The default is disabled. Use the no or default options to disable SPBM IP shortcuts.

The following table defines parameters for the redistribute command.

Variable

Value

{bgp | direct | ospf | rip | static}

Specifies the protocol.

enable

Enables the redistribution of the specified protocol into the SPBM network.

The default is disabled. Use the no option to disable the redistribution.

metric <0–65535>

Configures the metric (cost) to apply to redistributed routes. The default is 1.

metric-type {external|internal}

Configures the type of route to import into the protocol. The default is internal.

route-map WORD<0–64>

Configures the route policy to apply to redistributed routes. Type a name between 0 to 64 characters in length.

subnets {allow|suppress}

Indicates whether the subnets are advertised individually or aggregated to their classful subnet. Choose suppress to advertise subnets aggregated to their classful subnet. Choose allow to advertise the subnets individually with the learned or configured mask of the subnet. The default is allow.
tag <1-4294967295> Apply a tag to routes that BGP or OSPF redistribute to IS-IS. You can then configure route filtering to prevent tagged IS-IS routes from being redistributed back to either protocol.

The following table defines parameters for the isis apply redistribute command.

Variable

Value

{bgp | direct | ospf | rip | static}

Specifies the protocol.
9039040-00 Rev AB