Dell S3048-ON, Configuration Manual

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Figure 31. FRRP Ring Connecting VLT Devices
You can also configure an FRRP ring where both the VLT peers are connected to the FRRP ring and the VLTi acts as the primary interface
for the FRRP Master and transit nodes.
This active-active FRRP configuration blocks the FRRP ring on a per VLAN or VLAN group basis enabling the configuration to spawn
across different set of VLANs. The FRRP configuration where VLTi nodes act as the primary or secondary interfaces ensure that all the
optics used to connect VLT domains across data centers are fully utilized.
The primary requirement for the active-active FRRP configuration to work is that the VLTi between two VLT peers must act as the primary
interface of the Master and transit nodes of the FRRP ring.
NOTE: As the secondary interface of the FRRP master node is blocked for member VLAN traffic, VLTi cannot act as the
secondary interface in an FRRP ring topology.
Example Scenario
Following example scenario describes an Active-Active FRRP ring topology where the ring is blocked on a per VLAN or VLAN group basis
allowing active-active FRRP ring for different set of VLANs.
In this scenario, an FRRP ring named R1 is configured with VLT Node1 acting as the Master node and VLT Node2 as the transit node.
Simillary, an FRRP ring named R2 is configured with VLT Node2 as the master node and VLT node1 as the trasit node.
In the FRRP ring R1, the primary interface for VLT Node1 is the VLTi. P1 is the secondary interface, which is an orphan port that is
participating in the FRRP ring topology. V1 is the control VLAN through which the RFHs are exchanged indicating the health of the nodes
and the FRRP ring itself. In addition to the control VLAN, multiple member VLANS are configured (for example, M1 through M10) that carry
the data traffic across the FRRP rings. The secondary port P1 is tagged to the control VLAN (V1). VLTi is implicitly tagged to the member
VLANs when these VLANs are configured in the VLT peer.
As a result of the VLT Node1 configuration, the FRRP ring R1 becomes active by blocking the secondary interface P1 for the member
VLANs (M1 to M10).
VLT Node2 is the transit node. The primary interface for VLT Node2 is VLTi. P2 is the secondary interface, which is one of the orphan port
participating in the FRRP ring. V1 is the control VLAN through which the RFHs are exchanged. In addition to the control VLAN, multiple
member VLANS are configured (for example, M1 to M10) that carry the data traffic across the FRRP rings. The secondary port P2 is
tagged to the control VLAN (V1). VLTi is implicitly tagged to the member VLANs when these VLANs are configured in the VLT peer.
As a result of the VLT Node2 configuration on R2, the primary interface VLTi and the secondary interface P1 act as forwarding ports for the
member VLANs (M1 to M10).
Force10 Resilient Ring Protocol (FRRP) 281