34-17
Cisco ME 3800X and 3600X Switch Software Configuration Guide
OL-23400-01
Chapter 34 Configuring MPLS, MPLS VPN, MPLS OAM, and EoMPLS
Understanding MPLS Traffic Engineering and Fast Reroute
port-type nni
no switchport
ip vrf forwarding A
ip address 100.1.1.1 255.255.255.0
This example shows a Layer 3 VPN configured on a switchport and an SVI:
Switch#
show run interface g0/24
interface GigabitEthernet0/24
port-type nni
switchport access vlan 100
end
Switch#
show run interface vlan 100
interface Vlan100
ip vrf forwarding A
ip address 100.1.1.1 255.255.255.0
end
For information about load balancing, see this URL:
http://www.cisco.com/en/US/docs/routers/7600/ios/12.2SR/configuration/guide/pfc3mpls.html#wp134
7055
Understanding MPLS Traffic Engineering and Fast Reroute
This section describes the switch support of MPLS traffic engineering (TE) and includes these sections:
•
MPLS TE, page 34-17
•
MPLS TE Fast Reroute, page 34-18
•
MPLS TE Primary and Backup Autotunnel, page 34-19
MPLS TE
MPLS traffic engineering (TE) provides control over how traffic is routed through the network. This
increases the bandwidth efficiency by preventing over-use of some links while other links are under used.
TE overrides the shortest path selected by the Interior Gateway Protocol (IGP) to select the most efficient
path for traffic. Network resources are advertised by using a link-state routing protocol, such as
Intermediate System-to-Intermediate System (IS-IS) or Open Shortest Path First (OSPF). MPLS TE then
uses a unidirectional LSP or tunnel to forward traffic, calculating the tunnel paths based on required and
available resources.
Regular MPLS traffic engineering automatically establishes and maintains label-switched paths (LSPs)
across the backbone using Resource Reservation Protocol (RSVP). The path used by a given LSP is
based on the LSP resource requirements and available network resources such as bandwidth.
Available
resources are flooded via extensions to the link-state based IGP.
For more information on MPLS TE, see this URL:
http://www.cisco.com/en/US/docs/ios/mpls/configuration/guide/12_4/mp_12_4_book.html
