Transporting Packets Across an IP Backbone with MPLS
As described in the previous section, PE 1 and PE 2 exchange routing information,
including MPLS labels for their customer sites, by means of a BGP session established
between them across the service provider core.
NOTE:
To better understand MPLS before you read this section, see “Configuring
MPLS” on page 263.
Labels are employed in both the BGP control plane and the MPLS data plane. In the
control plane, BGP advertises a route with an in label; this in label is also the label
needed when MPLS traffic is received. BGP receives routes with an associated out
label; the out label is the label sent with MPLS traffic.
Consider the network shown in Figure 73 on page 384. If you display the in label on
PE 1, you see that MP-BGP advertises a labeled VPN-IPv4 prefix of 10.12.0.0/16 with
an in label of 24 (and an RD of 777:1, as shown in the illustration).
host1:pe1#
show ip bgp vpn all field in-label
Prefix In-label
10.12.0.0/16 24
10.24.0.0/16 none
Figure 73: BGP/MPLS VPN Route Exchange
If you display the in label on PE 2, you see that MP-BGP advertises a labeled VPN-IPv4
prefix of 10.24.0.0/16 with an in label of 16 (and an RD of 777:5, as shown in the
illustration).
384
■
Transporting Packets Across an IP Backbone with MPLS
JUNOSe 11.0.x BGP and MPLS Configuration Guide
Содержание JUNOSE
Страница 6: ...vi...
Страница 8: ...viii JUNOSe 11 0 x BGP and MPLS Configuration Guide...
Страница 24: ...xxiv Table of Contents JUNOSe 11 0 x BGP and MPLS Configuration Guide...
Страница 37: ...Part 1 Border Gateway Protocol Configuring BGP Routing on page 3 Border Gateway Protocol 1...
Страница 38: ...2 Border Gateway Protocol JUNOSe 11 0 x BGP and MPLS Configuration Guide...
Страница 234: ...198 Monitoring BGP JUNOSe 11 0 x BGP and MPLS Configuration Guide...
Страница 236: ...200 Multiprotocol Layer Switching JUNOSe 11 0 x BGP and MPLS Configuration Guide...
Страница 298: ...262 Point to Multipoint LSPs Configuration JUNOSe 11 0 x BGP and MPLS Configuration Guide...
Страница 346: ...310 Example Traffic Class Configuration for Differentiated Services JUNOSe 11 0 x BGP and MPLS Configuration Guide...
Страница 535: ...There is no no version See undebug ip mbgp Monitoring BGP MPLS VPNs 499 Chapter 5 Configuring BGP MPLS Applications...
Страница 536: ...500 Monitoring BGP MPLS VPNs JUNOSe 11 0 x BGP and MPLS Configuration Guide...
Страница 538: ...502 Layer 2 Services Over MPLS JUNOSe 11 0 x BGP and MPLS Configuration Guide...
Страница 592: ...556 Multiple ATM Virtual Circuits over a Single Pseudowire Example JUNOSe 11 0 x BGP and MPLS Configuration Guide...
Страница 604: ...568 Virtual Private LAN Service JUNOSe 11 0 x BGP and MPLS Configuration Guide...
Страница 618: ...582 VPLS References JUNOSe 11 0 x BGP and MPLS Configuration Guide...
Страница 642: ...606 VPLS Configuration Example with LDP Signaling JUNOSe 11 0 x BGP and MPLS Configuration Guide...
Страница 674: ...638 Virtual Private Wire Service JUNOSe 11 0 x BGP and MPLS Configuration Guide...
Страница 718: ...682 Monitoring MPLS Forwarding Table for VPWS JUNOSe 11 0 x BGP and MPLS Configuration Guide...
Страница 719: ...Part 6 Index Index on page 685 Index 683...
Страница 720: ...684 Index JUNOSe 11 0 x BGP and MPLS Configuration Guide...