Configure SPBM IP Shortcuts

In addition to Layer 2 virtualization, the SPBM model is extended to also support Routed SPBM, otherwise called SPBM IP Shortcuts.

SPBM allows a network to make the best use of routing and forwarding techniques, where only the BEBs perform an IP route lookup and all other nodes perform standard Ethernet switching based on the existing shortest path tree. This allows for end to end IP-over-Ethernet forwarding without the need for ARP, flooding, or reverse learning.

To enable IP shortcuts on the BEBs, you can configure a circuitless IP address (loopback address) and specify this adress 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.

After you have configured the SPBM infrastructure, you can enable SPBM IP shortcuts to advertise IP routes across the SPBM network using the following procedure.

Before you begin

You must configure the required SPBM and IS-IS infrastructure, which includes the creation of SPBM B-VLANs.
Before redistributing routes into IS-IS, you must create the Customer VLANs, add slots/ports, and add the IP addresses and network masks.

Procedure

In the navigation pane, expand Configuration > IS-IS.
Select IS-IS.
From the Globals tab, in IpSourceAddress, specify the CLIP interface to use as the source address for SBPM IP Shortcuts.

Note

For IPv6 Shortcuts, select ipv6 in Ipv6SourceAddressType, and then use Ipv6SourceAddress to specify the CLIPv6 interface to use as the source address for SBPM IPv6 Shortcuts.
Select Apply.
In the navigation pane, expand Configuration > IS-IS > SPBM.
Select the SPBM tab.
In IpShortcut, select enable.

Note

For IPv6 Shortcuts, select enable in Ipv6Shortcut.
Select Apply.
In the navigation pane, expand Configuration > IP.
Select Policy.
Select the Route Redistribution tab.
Select Insert to identify routes on the local switch to be announced into the SPBM network.
Using the fields provided, specify the source protocols to redistribute into IS-IS. In Protocol, ensure you specify isis as the destination protocol.
Select Insert.