Dell PowerConnect 7000 Series 스태킹 지침 - 페이지 33

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Dell PowerConnect 7000 Series에 대해서도 마찬가지입니다: 기술 백서 (34 페이지)

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Stacking Dell PowerConnect 7000 Series Switches

NSF Re-convergence Timing

As mentioned in the previous section, NSF protects against failures by check-pointing information to a

standby unit. In an NSF-protected stack, the worst-case scenario is when the master unit fails. The

following statistics show representative re-convergence times of an NSF-enabled standby switch as

measured from the detection of failure. With NSF enabled, data plane forwarding continues non-stop

on the non-failed switches while the standby unit converges the control plane protocols using the

check-pointed information. The re-convergence times given below include re-establishing

communication with the upper layer protocol peers, synchronization of shared information with the

peer, and re-establishment of any data plane forwarding paths around the failed master unit.

Medium Configuration



8 switches stacked



100 VLANs, all ports are members of all VLANs



4/4 static/dynamic lags with 8 members each



3 MSTP instance with VLANs



30 ACLs applied on 30 interfaces



10 Diffserv service interfaces with policies on 10 interfaces



6 VLAN routing interfaces



128 L2 Multicast group entries



512 ARP entries



128 Unicast routes

Parameter

L2 loss duration (non-failed or rerouted stack member)

L2 loss duration (failed/rerouted stack member)

L3 loss duration (failed/rerouted stack member)

IPMC loss duration (failed/rerouted stack member)

L2 convergence time

L3 convergence time

IPMC convergence time

Total convergence time

Timing

0 msec

10 msec

12 msec

25.70 sec

25.410 sec

25.420 sec

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