Nokia 7302 Manual page 200

Virtual Private LAN Service
configure>service>vpls service-id# stp max-age max-info-age
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Forward Delay
RSTP, as defined in the IEEE 802.1D-2004 standards, will normally transition to the
forwarding state via a handshaking mechanism (rapid transition), without any waiting
times. If handshaking fails (e.g. on shared links, see below), the system falls back to
the timer-based mechanism defined in the original STP (802.1D-1998) standard.
A shared link is a link with more than two Ethernet bridges (for example, a shared
10/100BaseT segment). The port-type command is used to configure a link as
point-to-point or shared.
For timer-based transitions, the 802.1D-2004 standard defines an internal variable
forward-delay, which is used in calculating the default number of seconds that an
SAP spends in the discarding and learning states when transitioning to the
forwarding state.
The value of the forward-delay variable depends on the STP operating mode of the
VPLS instance:
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configure>service>vpls service-id# stp forward-delay seconds
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Hello Time
The hello-time command configures the STP hello time for the VPLS STP instance.
The seconds parameter defines the default timer value that controls the sending
interval between BPDU configuration messages by this bridge, on ports where this
bridge assumes the designated role.
The active hello time for the spanning tree is determined by the root bridge (except
when the STP is running in RSTP mode, then the hello time is always taken from the
locally configured parameter).
The configured hello-time value can also be used to calculate the bridge forward
delay, "forward-delay".
configure>service>vpls service-id# stp hello-time hello-time
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200
Range: 6 to 40 seconds
Default: 20 seconds
Restore Default: no max-age
in all other situations, the value configured by the forward-delay command is
used.
Range: 4 to 30 seconds
Default: 15 seconds
Restore Default: no forward-delay
Range: 1 to 10 seconds
Default: 2 seconds
Restore Default: no hello-time
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FD 100/320Gbps NT and FX NT IHub Services Guide
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