Riverstone-networks WICT1-12 Manual do Utilizador descarregar pdf (Página 427)

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Riverstone Networks RS Switch Router User Guide Release 8.0 17-119

MPLS Configuration Traffic Engineering

17.7.3 IGP Shortcuts

Link-state IGPs, such as IS-IS and OSPF, use shortest path calculations to produce destination-first hop entries in the

routing table. With normal hop-by-hop routing, the first hop is a physical interface on the router. A logical interface,

which represents an explicit path LSP, can also be installed in the routing table to be used by the IGP as the first hop

to a specified destination. Thus, the LSP is used as a “shortcut” to a specific destination in the network.

Using IGP shortcuts provides the following benefits:

•

control of traffic to destinations that do not support MPLS LSPs

•

allows LSPs to be deployed on a regional basis

IGP shortcuts can be enabled on a per-router basis (it is disabled by default). When IGP shortcuts are enabled, each

router maintains a list of IGP shortcuts that originate at the local router and the ID of the router at the opposite end of

the shortcut. Traffic to nodes that are at the tail end of a shortcut and to nodes that are downstream from the end of a

shortcut will flow over the shortcut.

To enable IGP shortcuts on RS routers that use OSPF as the IGP:

To enable IGP shortcuts on RS routers that use IS-IS as the IGP:

Available BW [priority]:

[0] 12 Mbps [1] 12 Mbps

[2] 12 Mbps [3] 12 Mbps

[4] 12 Mbps [5] 12 Mbps

[6] 12 Mbps [7] 12 Mbps

To: 1212.1212.1212.0e, Local: 186.1.1.26, Remote: 186.1.1.12

Color: 0x8

Static BW: 20 Mbps

Reservable BW: 20 Mbps

Available BW [priority]:

[0] 20 Mbps [1] 20 Mbps

[2] 20 Mbps [3] 20 Mbps

[4] 20 Mbps [5] 20 Mbps

[6] 20 Mbps [7] 20 Mbps

ip-router global set install-lsp-routes on

ospf set igp-shortcuts on

ip-router global set install-lsp-routes on

isis set igp-shortcuts enable

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