Feature |
Product |
Release introduced |
---|---|---|
IS-IS authentication with SHA-256 |
5320 Series |
Fabric Engine 8.6 |
5420 Series |
VOSS 8.4 |
|
5520 Series |
VOSS 8.2.5 |
|
5720 Series |
Fabric Engine 8.7 |
|
7520 Series |
Fabric Engine 8.10 |
|
7720 Series |
Fabric Engine 8.10 |
|
VSP 4450 Series |
VOSS 7.0 |
|
VSP 4900 Series |
VOSS 8.1 |
|
VSP 7200 Series |
VOSS 7.0 |
|
VSP 7400 Series |
VOSS 8.0 |
|
VSP 8200 Series |
VOSS 7.0 |
|
VSP 8400 Series |
VOSS 7.0 |
|
VSP 8600 Series |
VSP 8600 6.1 |
|
XA1400 Series |
VOSS 8.0.50 |
|
Suspend duplicate system ID detection |
5320 Series |
Fabric Engine 8.6 |
5420 Series |
VOSS 8.4 |
|
5520 Series |
VOSS 8.2.5 |
|
5720 Series |
Fabric Engine 8.7 |
|
7520 Series |
Fabric Engine 8.10 |
|
7720 Series |
Fabric Engine 8.10 |
|
VSP 4450 Series |
VOSS 6.1 |
|
VSP 4900 Series |
VOSS 8.1 |
|
VSP 7200 Series |
VOSS 6.1 |
|
VSP 7400 Series |
VOSS 8.0 |
|
VSP 8200 Series |
VOSS 6.1 |
|
VSP 8400 Series |
VOSS 6.1 |
|
VSP 8600 Series |
VSP 8600 6.1 |
|
XA1400 Series |
VOSS 8.0.50 |
|
Multiple IS-IS parallel adjacencies |
5320 Series |
Fabric Engine 8.6 |
5420 Series |
VOSS 8.4 |
|
5520 Series |
VOSS 8.2.5 |
|
5720 Series |
Fabric Engine 8.7 |
|
7520 Series |
Fabric Engine 8.10 |
|
7720 Series |
Fabric Engine 8.10 |
|
VSP 4450 Series |
VOSS 7.0 |
|
VSP 4900 Series |
VOSS 8.1 |
|
VSP 7200 Series |
VOSS 7.0 |
|
VSP 7400 Series |
VOSS 8.0 |
|
VSP 8200 Series |
VOSS 7.0 |
|
VSP 8400 Series |
VOSS 7.0 |
|
VSP 8600 Series |
Not Supported |
|
XA1400 Series |
Not Supported |
SPBM eliminates the need for multiple overlay protocols in the core of the network by reducing the core to a single Ethernet-based, link-state protocol (IS-IS). IS-IS provides virtualization services using a pure Ethernet technology base. SPBM also uses IS-IS to discover and advertise the network topology, which enables it to compute the shortest path to all nodes in the SPBM network.
IS-IS is a link-state, interior gateway protocol that was developed for the International Organization for Standardization (ISO). ISO terminology refers to routers as Intermediate Systems (IS), hence the name Intermediate System-to-Intermediate System (IS-IS).
To provide a loop-free network and to learn and distribute network information, SPBM uses the Intermediate-System-to-Intermediate-System (IS-IS) link state routing protocol. IS-IS is designed to find the shortest path from any one destination to any other in a dynamic fashion. IS-IS creates any-to-any connectivity in a network in an optimized, loop-free manner, without the long convergence delay experienced with the Spanning Tree Protocol. IS-IS does not block ports from use, but rather employs a specific path. As such, all links are available for use.
Note
Only an active interface with an active adjacency is added into local SPF calculations. This mechanism ensures the local node selects the shortest path and has the same view as the rest of the SPB network.
In the SPBM environment for Layer 2 VSNs, IS-IS carries only pure Layer 2 information with no requirement for an underlying IP control plane or forwarding path. IS-IS runs directly over Layer 2.
Note
SPBM carries Layer 3 information for Layer 3 VSNs.
In SPBM networks, IS-IS performs the following functions:
Discovers the network topology
Builds shortest path trees between the network nodes:
Forwards unicast traffic
Determines the forwarding table for multicast traffic
Communicates network information in the control plane:
Service Instance Identifier (I-SID) information
SPBM can distribute I-SID service information to all SPBM nodes, as the I-SIDs are created. SPBM includes I-SID information in the IS-IS Link State protocol data units (PDUs). When a new service instance is provisioned on a node, its membership is flooded throughout the topology using an IS-IS advertisement.