IP Router Configuration
7750 SR OS Router Configuration Guide
Page 49
6PE Control Plane Support
The 6PE MP-BGP routers support:
•
IPv4/IPv6 dual-stack
•
MP-BGP can be used between 6PE routers to exchange IPv6 reachability information.
The 6PE routers exchange IPv6 prefixes over MP-BGP sessions running over IPv4
transport. The MP-BGP AFI used is IPv6 (value 2).
An IPv4 address of the 6PE router is encoded as an IPv4-mapped IPv6 address in the
BGP next-hop field of the IPv6 NLRI. By default, the IPv4 address that is used for
peering is used. It is configurable through the route policies.
The 6PE router binds MPLS labels to the IPv6 prefixes it advertises. The SAFI used in
MP-BGP is the SAFI (value 4) label. The router uses the IPv6 explicit null (value 2)
label for all the IPv6 prefixes that it advertises and can accept an arbitrary label from
its peers.
•
LDP is used to create the MPLS full mesh between the 6PE routers and the IPv4 addresses
that are embedded in the next-hop field are reachable by LDP LSPs. The ingress 6PE
router uses the LDP LSPs to reach remote 6PE routers.
6PE Data Plane Support
The ingress 6PE router can push two MPLS labels to send the packets to the egress 6PE router. The
top label is an LDP label used to reach the egress 6PE router. The bottom label is advertised in
MP-BGP by the remote 6PE router. Typically, the IPv6 explicit null (value 2) label is used but an
arbitrary value can be used when the remote 6PE router is from a vendor other than Alcatel-
Lucent.
The egress 6PE router pops the top LDP tunnel label. It sees the IPv6 explicit null label, which
indicates an IPv6 packet is encapsulated. It also pops the IPv6 explicit null label and performs an
IPv6 route lookup to find out the next hop for the IPv6 packet.
Содержание 7750 SR-OS
Страница 10: ...Page 10 7750 SR OS Router Configuration Guide List of Tables...
Страница 12: ...Page 12 7750 SR OS Router Configuration Guide List of Figures...
Страница 18: ...Getting Started Page 18 7750 SR OS Router Configuration Guide...
Страница 108: ...IP Router Command Reference Page 108 7750 SR OS Router Configuration Guide...
Страница 200: ...Router Advertisement Commands Page 200 7750 SR OS Router Configuration Guide...
Страница 269: ...IP Router Configuration 7750 SR OS Router Configuration Guide Page 269 LDP 1 1 SDP 1 1 A ALA A config service...
Страница 299: ...IP Router Configuration 7750 SR OS Router Configuration Guide Page 299...
Страница 300: ...Debug Commands Page 300 7750 SR OS Router Configuration Guide...
Страница 348: ...Page 348 7750 SR OS Router Configuration Guide...
Страница 388: ...Page 388 7750 SR OS Router Configuration Guide...
Страница 442: ...Configuration Notes Page 442 7750 SR OS Router Configuration Guide...
Страница 470: ...Filter Management Tasks Page 470 7750 SR OS Router Configuration Guide...
Страница 586: ...Configuration Notes Page 586 7750 SR OS Router Configuration Guide...
Страница 588: ...OpenFlow Command Reference Page 588 7750 SR OS Router Configuration Guide...
Страница 598: ...Show Commands Page 598 7750 SR OS Router Configuration Guide...
Страница 608: ...Page 608 7750 SR OS Router Configuration Guide...
Страница 646: ...Page 646 7750 SR OS Router Configuration Guide...
Страница 660: ...Page 660 7750 SR OS Router Configuration Guide...
Страница 666: ...Common CLI Command Descriptions Page 666 7750 SR OS Router Configuration Guide...