IS-IS Accept Policy Filters

You can filter traffic with IS-IS accept policies by:

advertising BEB
I-SID or I-SID list
route-map
backbone-route-map for IPv4 only
a combination of route-map and backbone-route-map for IPv4 only

You can use IS-IS accept policies to apply at a global default level for all advertising Backbone Edge Bridges (BEBs) or for a specific advertising BEB.

IS-IS accept policies also allow you to use either a service instance identifier (I-SID) or an I-SID list to filter routes. The switch uses I-SIDs to define Virtual Services Networks (VSNs). I-SIDs identify and transmit virtualized traffic in an encapsulated SPBM frame. IS-IS accept policies can use I-SIDs or I-SID lists to filter the incoming virtualized traffic.

IS-IS accept policies can also apply route policies to determine what incoming traffic to accept into the routing table. With route policies the device can determine which routes to accept into the routing table based on the criteria you configure. You can match on the network or the route metric.

On DvR Controllers in a DvR domain, you can configure a backbone route policy to determine what host routes to accept from the DvR backbone, into the routing table. Also, just like on the route policy, you can configure match criteria, and set preferences on the backbone route policy.

To accept both IS-IS routes and host routes from the DvR backbone, you can configure both a route policy and a backbone route policy in the accept policy instance.

For more information on configuring route policies:

For IPv4, see IP routing operations fundamentals.
For IPv6, see IPv6 Routing Basics.

The following table describes IPv4 IS-IS accept policy filters.


Filters into	Filter	Description
Global Routing Table (GRT)	accept route-map `WORD<1-64>`	By default, the device accepts all routes into the GRT and VRF routing table. This is the default accept policy.
	accept route-map `WORD<1-64>` backbone-route-map `WORD<1–64>`	This is the default accept policy with configuration to accept specific DvR host routes from the DvR backbone.
	accept adv-rtr `<x.xx.xx>` route-map `WORD<1-64>` backbone-route-map `WORD<1-64>`	The device filters based on the specific advertising BEB defined by the SPBM nickname. The device, if DvR enabled, also filters the DvR host routes to accept from the DvR backbone. This is an optional filter.
	accept i-sid `<1-16777215>` route-map `WORD<1-64>` backbone-route-map `WORD<1-64>`	The device filters based on the I-SID, which represents a local or remote Layer 3 VSN. The device, if DvR enabled, also filters the DvR host routes to accept from the DvR backbone. This is an optional filter.
	accept adv-rtr `<x.xx.xx>` i-sid `<1-16777215>` route-map `WORD<1-64>` backbone-route-map `WORD<1-64>`	The device filters based on the specific advertising BEB and the I-SID, which represents a local or remote Layer 3 VSN. The device, if DvR enabled, also filters the DvR host routes to accept from the DvR backbone. This is an optional filter.
	accept isid-list `WORD<1-32>` route-map `WORD<1-64>` backbone-route-map `WORD<1-64>`	The device filters based on the list of I-SIDs. The device, if DvR enabled, also filters the DvR host routes to accept from the DvR backbone. This is an optional filter.
	accept adv-rtr `<x.xx.xx>` isid-list `WORD<1-32>` route-map `WORD<1-64>` backbone-route-map `WORD<1-64>`	The device filters based on the specific advertising BEB and the list of I-SIDs. The number 0 represents the Global Routing Table (GRT). The device, if DvR enabled, also filters the DvR host routes to accept from the DvR backbone. This is an optional filter.
Virtual Routing and Forwarding (VRF) routing table	isis accept adv-rtr `<x.xx.xx>` route-map `WORD<1-64>` backbone-route-map `WORD<1-64>`	The device filters based on the specific advertising BEB defined by the SPBM nickname. The device, if DvR enabled, also filters the DvR host routes to accept from the DvR backbone. This is an optional filter.
	isis accept i-sid `<0-16777215>` route-map `WORD<1-64>` backbone-route-map `WORD<1-64>`	The device filters based on the I-SID, which represents a local or remote Layer 3 VSN. The number 0 represents the Global Routing Table (GRT). The device, if DvR enabled, also filters the DvR host routes to accept from the DvR backbone. This is an optional filter.
	isis accept adv-rtr `<x.xx.xx>` i-sid `<0-16777215>` route-map `WORD<1-64>` backbone-route-map `WORD<1-64>`	The device filters based on the specific advertising BEB and the I-SID, which represents a local or remote Layer 3 VSN. The number 0 represents the Global Routing Table (GRT). The device, if DvR enabled, also filters the DvR host routes to accept from the DvR backbone. This is an optional filter.
	isis accept isid-list `WORD<1-32>` route-map `WORD<1-64>` backbone-route-map `WORD<1-64>`	The device filters based on the list of I-SIDs to which the IS-IS accept policy applies. The number 0 represents the Global Routing Table (GRT). The device, if DvR enabled, also filters the DvR host routes to accept from the DvR backbone. This is an optional filter.
	isis accept adv-rtr `<x.xx.xx>` isid-list `WORD<1-32>` route-map `WORD<1-64>` backbone-route-map `WORD<1-64>`	The device filters based on the specific advertising BEB and the list of I-SIDs. The number 0 represents the Global Routing Table (GRT). The device, if DvR enabled, also filters the DvR host routes to accept from the DvR backbone. This is an optional filter.
	isis accept route-map `WORD<1-64>` route-map `WORD<1-64>` backbone-route-map `WORD<1-64>`	The device filters based on the route policy. The device, if DvR enabled, also filters the DvR host routes to accept from the DvR backbone. This is an optional filter.

The following table describes the IPv6 IS-IS accept policy filters:


Filters into	Filter	Description
Global Routing Table (GRT)	ipv6 accept route-map `WORD<1-64>`	By default, the device accepts all routes advertised. This is the default accept policy.
	ipv6 accept adv-rtr `<x.xx.xx>` route-map `WORD<1-64>`	The device filters based on the specific advertising BEB defined by the SPBM nickname.
	ipv6 accept i-sid `<1-16777215>` route-map `WORD<1-64>`	The device filters based on the I-SID, which represents a local or remote Layer 3 VSN.
	ipv6 accept adv-rtr `<x.xx.xx>` i-sid `<1-16777215>` route-map `WORD<1-64>`	The device filters based on the specific advertising BEB and the I-SID, which represents a local or remote Layer 3 VSN.
	ipv6 accept isid-list `WORD<1-32>` route-map `WORD<1-64>`	The device filters based on the list of I-SIDs.
	ipv6 accept adv-rtr `<x.xx.xx>` isid-list `WORD<1-32>` route-map `WORD<1-64>`	The device filters based on the specific advertising BEB and the list of I-SIDs. The number 0 represents the Global Routing Table (GRT).
Virtual Routing and Forwarding (VRF) routing table	ipv6 isis accept route-map `WORD<1-64>` route-map `WORD<1-64>`	The device filters based on the route policy.
	ipv6 isis accept adv-rtr `<x.xx.xx>` route-map `WORD<1-64>`	The device filters based on the specific advertising BEB defined by the SPBM nickname.
	ipv6 isis accept i-sid `<0-16777215>` route-map `WORD<1-64>`	The device filters based on the I-SID, which represents a local or remote Layer 3 VSN. The number 0 represents the Global Routing Table (GRT).
	ipv6 isis accept adv-rtr `<x.xx.xx>` i-sid `<0-16777215>` route-map `WORD<1-64>`	The device filters based on the specific advertising BEB and the I-SID, which represents a local or remote Layer 3 VSN. The number 0 represents the Global Routing Table (GRT).
	ipv6 isis accept isid-list `WORD<1-32>` route-map `WORD<1-64>`	The device filters based on the list of I-SIDs to which the IS-IS accept policy applies. The number 0 represents the Global Routing Table (GRT).
	ipv6 isis accept adv-rtr `<x.xx.xx>` isid-list `WORD<1-32>` route-map `WORD<1-64>`	The device filters based on the specific advertising BEB and the list of I-SIDs. The number 0 represents the Global Routing Table (GRT).