Specifications

Chapter 3. Reference architectures 115
Loopback interfaces are used for static router-ID assignment to use with OSPFv2 and
OSPFv3. Table 3-9 shows the loopback interfaces IP addresses assignment
Table 3-9 Loopback interfaces
Keep the STP bridge priorities consistent with VRRP priorities, that is, make sure that the
switch that is a root bridge for STP is also an active router for VRRP for that VLAN.
Table 3-10 shows the VRRP groups and priorities what we used in the topology.
Table 3-10 VRRP groups and priorities
OSPFv2 and OSPFv3
We run single-area Open Shortest Path First (OSPF) in area number 0 (backbone).
OSPF is run on all Layer 3 interfaces. IP interfaces of VLANs are configured with the
passive-interface option, so that the hellos are not exchanged over them.
VLAN102 102 10.0.102.2 112 FC12::2/64 AGG-2
VLAN100 100 10.0.100.2 110 FC00::2/64 AGG-2
VLAN IPv4 interface IPv4 address IPv6 interface IPv6 address Device
IP address Loopback Device
1.1.1.1/32 Loopback 1 AGG-1
1.1.1.2/32 Loopback 1 AGG-2
2.2.2.1/32 Loopback 1 ACC-1
2.2.2.2/32 Loopback 1 ACC-2
VRRP group ACC-1 priority ACC-2 priority
10 105 100 (default)