Fujitsu PSWITCH 2048T User Manual page 60

FUJITSU PSWITCH
VPC switches: VPC-aware switches. No more than two VPC-aware switches can pair
to form one end of the LAG. In Figure 3-1 VPC Topology, SW1 and SW2 are VPC peer
switches. These two switches form a logical end point for the VPC.
VPC interfaces: Port channels (LAGs) on VPC-aware switches that are configured as
VPCs. VPC functionality is a property of port channels. The administrator can
configure multiple instances of VPC interfaces on the two VPC switches. The switch
supports 63 instances of VPC interfaces. Port-channel functionality like min-links
and the maximum number of ports supported per LAG applies to VPC interfaces
too.
VPC member ports: Ports on both VPC switches that are part of the VPC interface
(P1 on SW1 and S1 on SW2)
Non redundant ports: (Non-VPC) ports on either switches that are not part of the
VPC (ports P4 and S4). VLANs cannot be shared between VPC interfaces and
non-redundant ports.
VPC peer link: A link between the two VPC peer switches (ports P2, P3, S2, S3). This
link is used to carry:
 Keep-alive packets between the two peer switches. The keep-alive protocol is
used to elect the Primary and the Secondary switch.
 PDUs and LACPDUs between the Secondary and Primary VPC devices.
 Control messages such as VPC member port related events, FDB/MFDB entries,
configuration details. In addition to supporting best-effort delivery of these
messages, The switch supports both Synchronous Reliable Control Message
Delivery and Asynchronous Reliable Control Message Delivery mechanisms. If
the message is received by the peer, it sends an ACK back to the calling VPC
component to acknowledge receipt of the message. The VPC application will try
three times every second until an ACK is received. If an ACK is not received at the
end of all the attempts, an error is reported back to the calling component.
Data traffic over the peer's VPC member ports, when the member ports of the
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VPC interface are all down on this device.
The switch supports peer failure fast detection, which enables detecting a peer
failure in 1 second when DCPDP is enabled.
I
Only one peer-link can be configured per device. The peer-link is crucial for
the operation of the VPC component. A port channel must be configured as
the peer-link. VLANs configured on VPC interfaces must be configured on
the peer-link as well.
VPC Dual Control Plane Detection link: A virtual link that is used to advertise the
dual control plane detection protocol (DCPDP) packets between the two VPC
switches (ports P4, S4). This protocol is optional. The protocol indicates the
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User's Guide
December/2018