Services
7210 SAS-X, R6 OS Services Guide Page 37
Spoke and MESH SDPs
When an SDP is bound to a service, it is bound as either a spoke SDP or a mesh SDP. The type of
SDP indicates how flooded traffic is transmitted. The 7210 SAS-M devices supports both spoke
and mesh SDPs.
A spoke SDP is treated like the equivalent of a traditional bridge “port” where flooded traffic
received on the spoke SDP is replicated on all other “ports” and not transmitted on the port it was
received.
All mesh SDPs bound to a service are logically treated like a single bridge “port” for flooded
traffic where flooded traffic received on any mesh SDP on the service is replicated to other “ports”
(spoke SDPs and SAPs) and not transmitted on any mesh SDPs.
SDP Using BGP Route Tunnel
SDP is enhanced to use BGP route tunnel to extend inter-AS support for L2 and L3 VPN services.
An SDP can be configured to use MPLS transport method. MPLS SDP support is enhanced to
allow a BGP route tunnel to reach the far-end PE. A single method of tunneling is allowed per
SDP (for example, LDP, RSVP-TE LSP or BGP route tunnel). BGP route tunnel method is
excluded if multi-mode transport is enabled for an SDP.
A single method of tunneling is allowed per SDP (for example: LDP, RSVP-TE LSP or BGP route
tunnel). BGP route tunnel method is excluded if multi-mode transport is enabled for an SDP.
For inter-AS far-end PE, next-hop for BGP route tunnel must be one of the local ASBR. The LSP
type selected to reach the local ASBR (BGP labeled route next-hop) must be configured under the
BGP global context. LDP must be supported to provide transport LSP to reach the BGP route
tunnel next-hop.
Only BGP route labels can be used to transition from ASBR to the next-hop ASBR. The global
BGP route tunnel transport configuration option must be entered to select an LSP to reach the PE
node from ASBR node. On the last BGP segment, both “BGP+LDP” and LDP routes may be
available to reach the far-end PE from the ASBR node. LDP LSP must be preferred due to higher
protocol priority. This leads to just one label besides other labels in stack to identify VC/VPN at
far-end PE nodes.
SDP Keepalives
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