Subscriber Services
7750 SR OS Services Guide Page 167
mixed-lsp-mode
Syntax [no] mixed-lsp-mode
Context config>service>sdp
Description This command enables the use by an SDP of the mixed-LSP mode of operation.
The mixed-lsp-mode keyword allows both RSVP and LDP LSPs to be configured on a single SDP.
Only one transport type is active with RSVP LSPs having a higher priority than LDP LSPs.
At any given time, the service manager programs only one type of LSP in the IOM which will
activate it to forward service packets according to the following priority order:
2. RSVP LSP type. Up to 16 RSVP LSPs can be entered by the user and programmed by the ser-
vice manager in ingress IOM to load balance service packets. This is the highest priority LSP
type.
3. LDP LSP type. One LDP FEC programmed by the service manager but ingress IOM can use up
to 16 LDP ECMP paths for the FEC to load balance service packets when ECMP is enabled on
the node.
The service manager will program the NHLFE(s) for the active LSP type preferring the RSVP LSP
type over the LDP LSP type. If no RSVP LSP is configured or all configured RSVP LSPs go down,
the service manager will re-program the IOM with the LDP LSP if available. If not, the SDP goes
operationally down.
When a higher priority type LSP becomes available, the service manager reverts back to this LSP at
the expiry of the sdp-revert-time timer or the failure of the currently active LSP, whichever comes
first. The service manager then re-programs the IOM accordingly. If the infinite value is configured,
then the SDP reverts to the highest priority type LSP only if the currently active LSP failed.
Note however that LDP uses a tunnel down damp timer that is set to three seconds by default. When
the LDP LSP fails, the SDP will revert to the RSVP LSP type after the expiration of this timer. For an
immediate switchover this timer must be set to zero. The command for this timer is
configure>router>ldp>tunnel-down-damp-time.
If the user changes the value of the sdp-revert-time timer, it will take effect only at the next use of the
timer. Any pre-existing timer at the time of the change will be restarted with the new value.
If class-based forwarding is enabled for this SDP, the forwarding of the packets over the RSVP LSPs
will be based on the FC of the packet as in the current implementation. When the SDP activates the
LDP LSP type, packets are forwarded over the LDP ECMP paths using the regular hash routine.
The no form of this command disables the mixed-LSP mode of operation. The user first has to
remove one of the LSP types from the SDP configuration or the command will fail.
Default no mixed-lsp-mode
sdp-revert-time
Syntax sdp-revert-time seconds | infinite
no sdp-revert-time
Context config>service>sdp>mixed-lsp-mode
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