Weighted Ecmp By Rsvp-Te Or Sr-Te Lsps - Nokia 7705 SAR-W Series Manual

MPLS and RSVP-TE

3.13 Weighted ECMP by RSVP-TE or SR-TE LSPs

ECMP over MPLS LSPs implements packet spraying across multiple RSVP-TE or
SR-TE LSPs within the same ECMP set.
ECMP RSVP-TE or SR-TE packet spraying consists of hashing the relevant fields in
the header of a labeled packet and selecting the next-hop tunnel based on the
modulo operation of the output of the hash and the number of ECMP tunnels. The
maximum number of ECMP tunnels selected from the Tunnel Table Manager (TTM)
matches the value of the user-configured ecmp command. Only LSPs with the same
lowest LSP metric can be part of the ECMP set. If the number of these LSPs is higher
than the value configured with the ecmp command, the LSPs with the lowest tunnel
IDs are selected first.
The ecmp command context for setting the number of routes that are used on a
service is as follows:
Note: The 7705 SAR supports a maximum of eight ECMP routes, which is the maximum
value that an LSP can support after normalization.
With the weighted ECMP functionality, the load-balancing weight of the LSP is
normalized by the system and then used to bias the amount of traffic forwarded over
each LSP.
Weighted ECMP is supported on the following services:
120
• for VPRN auto-bind weighted ECMP: config>service>vprn>auto-bind-
tunnel>ecmp max-ecmp-routes
• for OSPF PE-CE weighted ECMP: config>service>vprn>ecmp max-ecmp-
routes
• for VPN route-reflector forwarding with next-hop-self: config>router>ecmp
max-ecmp-routes
• for weighted ECMP for SDPs: the number of LSPs specified in the command
config>service>sdp>lsp lspx lspy lspz or config>service>sdp>sr-te-lsp lspx
lspy lspz
• for EVPN auto-bind weighted ECMP: config>service>epipe>bgp-
evpn>mpls>auto-bind-tunnel>ecmp max-ecmp-routes or
config>service>vpls>bgp-evpn>mpls>auto-bind-tunnel>ecmp max-ecmp-
routes
• VPRN with auto-bind tunnels
• EVPN-VPWS and EVPN-VPLS with auto-bind tunnels
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