Make-Before-Break (Mbb); Ecmp Support; Inter-As Non-Segmented Mldp; Ldp Recursive Fec Process - Nokia 7705 SAR-W Series Manual

MPLS Guide

5.2.3 Make-Before-Break (MBB)

When a transit or leaf node detects that the upstream node towards the root node of
a multicast tree has changed, the node follows the graceful procedure that allows
make-before-break transition to the new upstream node. Make-before-break support
is optional via the mp-mbb-time command. If the new upstream node does not
support MBB procedures, the downstream node waits for the configured timer to time
out before switching over to the new upstream node.

5.2.4 ECMP Support

If multiple ECMP paths exist between two adjacent nodes, then the upstream node
of the multicast receiver programs all entries in the forwarding plane. Only one entry
is active and it is based on the ECMP hashing algorithm.

5.2.5 Inter-AS Non-segmented mLDP

This feature allows multicast services to use segmented protocols and span them
over multiple autonomous systems (ASs) in the same way as unicast services.
Because IP VPN or GRT services span multiple IGP areas or multiple ASs, either for
a network designed to deal with scale or as result of commercial acquisitions,
operators may require inter-AS VPN (unicast) connectivity. For example, an inter-AS
VPN can break the IGP, MPLS, and BGP protocols into access segments and core
segments, allowing higher scaling of protocols by segmenting them into their own
islands. The 7705 SAR allows for a similar provisioning of multicast services and for
spanning these services over multiple IGP areas or multiple ASs.
Multicast LDP (mLDP) supports non-segmented mLDP trees for inter-AS solutions
that are applicable for NG-MVPN services.
5.2.5.1
For inter-AS networks where the leaf node does not have the root in the RTM or
where the leaf node has the root in the RTM using BGP, and the leaf's local AS
intermediate nodes do not have the root in their RTM because they are not
BGP-enabled, RFC 6512 defines a recursive opaque value and procedure for LDP
to build an LSP through multiple ASs.
3HE 18686 AAAB TQZZA

LDP Recursive FEC Process

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