Vpc Enhance Mode; Fast-Failover - Fujitsu PSWITCH 2048T User Manual

User's Guide
presence of the peer switch in the network. The DCPDP protocol should not be
configured on VPC interfaces. The DCPDP packet transmission interval and
reception timeout duration are configurable.
I The two switches that form the VPC pair (primary/secondary) must support
the same set of features and have equal capacity (for example, number of
FDB entries supported and number of ports). Additionally, the peer
switches that form the VPC pair must run the same firmware version.

3.1.2.6.1. VPC Enhance Mode

The switch supports VPC enhance mode that non-VPC port can connect to other
switch port. The topology in figure.
Non-LAG
device
P4
SW1
P1
Figure 3-2: VPC Enhance Mode

3.1.2.6.2. Fast-Failover

The switch supports configuration of a unique VPC MAC address and VPC system
priority, which enable fast-failover in the event a primary switch failure. The
secondary switch advertises these VPC values—instead of the switch MAC address
and system priority— in LACP PDUs sent on VPC member ports. The secondary switch
also uses the VPC MAC address in the designated bridge ID field in STP BPDUs sent
on VPC member ports. For non-redundant ports, the secondary switch uses the
switch MAC address and system priority values in LACPDUs and STP BPDUs.
In the case of a primary switch failure, traffic disruption is limited to the time
required for the partner devices that are dual-attached to the MLAG domain to
detect the link down on the primary device and redistribute the traffic using the
December/2018
Non-LAG
device
Peer Link
P2 S2
SW2
P3 S3
S1
VPC
LAG
VPC Unaware
LAG Partner
S4
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