Cisco WS-SUP32-GE-3B Software Configuration Guide - Page 311

Chapter 21 Configuring Multiprotocol Label Switching MPLS Label Switching • Time to live (TTL) operation-At the ingress edge of the MPLS network, the TTL value in the MPLS frame header can be received from either the TTL field of the IP packet header or the user-configured value from the adjacency entry. At the egress of the MPLS network, the final TTL equals the minimum (label TTL and IP TTL)-1. Note With the Uniform mode, the TTL is taken from the IP TTL; with the Pipe mode, a value of 255, taken from the hardware register, is used for the outgoing label. • QoS-Information on Differentiated Services (DiffServ) and ToS from IP packets can be mapped to MPLS EXP field. • MPLS/VPN Support-Up to 1024 VRFs can be supported (over 511 VRFs requires recirculation). • Ethernet over MPLS-The Ethernet frame can be encapsulated at the ingress to the MPLS domain and the Ethernet frame can be decapsulated at the egress. • Packet recirculation-The PFC3B provides the capability to recirculate the packets. See the "Recirculation" section on page 21-4. • Configuration of MPLS switching is supported on VLAN interfaces with the mpls ip command. Supported Cisco IOS Features The following Cisco IOS software features are supported: Note Multi-VPN Routing and Forwarding (VRF) for CE Routers (VRF Lite) is supported with the following features: IPv4 forwarding between VRFs interfaces, IPv4 ACLs, and IPv4 HSRP. IPv4 multicast is not supported. • Multi-VRF for CE Routers (VRF Lite)-VRF-lite is a feature that enables a service provider to support two or more VPNs (using only VRF-based IPv4), where IP addresses can be overlapped among the VPNs. See this publication: http://www.cisco.com/en/US/products/hw/routers/ps259/prod_bulletin09186a00800921d7.html. • MPLS on Cisco routers-This feature provides basic MPLS support for imposing and removing labels on IP packets at label edge routers (LERs) and switching labels at label switch routers (LSRs). See this publication: http://www.cisco.com/en/US/docs/ios/12_0st/12_0st21/feature/guide/fs_rtr.html. • MPLS TE-MPLS traffic engineering software enables an MPLS backbone to replicate and expand upon the traffic engineering capabilities of Layer 2 ATM and Frame Relay networks. MPLS traffic engineering thereby makes traditional Layer 2 features available to Layer 3 traffic flows. For more information, see these publications: http://www.cisco.com/en/US/docs/ios/12_2/switch/configuration/guide/xcftagc_ps1835_TSD_Products _Configuration_Guide_Chapter.html http://www.cisco.com/en/US/tech/tk436/tk428/technologies_configuration_example09186a008009 3fcb.shtml http://www.cisco.com/en/US/tech/tk436/tk428/technologies_configuration_example09186a008009 3fd0.shtml OL-11439-03 Catalyst Supervisor Engine 32 PISA Cisco IOS Software Configuration Guide, Release 12.2ZY 21-5