Carrier-of-Carriers IPv4 VPNs ......................................................................469
Customer Carrier as an Internet Service Provider .................................470
Configuration Steps ........................................................................471
Customer Carrier as a VPN Service Provider .........................................472
Configuration Steps ........................................................................473
Enabling Carrier-of-Carriers Support on a VRF ......................................474
Carrier-of-Carriers Using BGP as the Label Distribution Protocol ...........475
Carrier-of-Carriers IPv6 VPNs ......................................................................475
Connecting IPv6 Islands Across IPv4 Clouds with BGP ................................476
Connecting IPv6 Islands Across Multiple IPv4 Domains ........................477
Configuring IPv6 Tunneling over IPv4 MPLS .........................................478
OSPF and BGP/MPLS VPNs ..........................................................................479
Distributing OSPF Routes from CE Router to PE Router ........................480
Distributing Routes Between PE Routers ...............................................480
Preserving OSPF Routing Information Across the MPLS/VPN
Backbone .......................................................................................480
OSPF Domain Identifier Attribute ...................................................480
OSPF Route Type Attribute .............................................................481
Distributing OSPF Routes from PE Router to CE Router ........................481
Preventing Routing Loops .....................................................................482
Using Remote Neighbors to Configure OSPF Sham Links ......................482
OSPF Backdoor Links .....................................................................483
OSPF Sham Links ...........................................................................483
Configuration Tasks ..............................................................................485
Configuring VPLS ........................................................................................487
Configuring L2VPNs ....................................................................................487
Monitoring BGP/MPLS VPNs ........................................................................487
Part 3 Layer 2 Services Over MPLS
Chapter 6 Layer 2 Services over MPLS Overview 509
Layer 2 Services over MPLS Overview .........................................................509
Layer 2 Services over MPLS Platform Considerations ..................................510
Module Requirements ...........................................................................510
Interface Specifiers ...............................................................................511
Layer 2 Services over MPLS References ......................................................511
Layer 2 Services over MPLS Implementation ...............................................512
Local Cross-Connects Between Layer 2 Interfaces Using MPLS ....................513
MPLS Shim Interfaces for Layer 2 Services over MPLS ................................513
Multiple Layer 2 Services over MPLS ...........................................................515
ATM Layer 2 Services over MPLS ................................................................515
AAL5 Encapsulation ..............................................................................516
OAM Cells .............................................................................................516
QoS Classification ...........................................................................517
Limitations .....................................................................................517
Control Word Support ....................................................................517
Table of Contents â– xix
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