Vrrp; Vrrpv2; Vrrp3 - Siemens SCALANCE XM-400 Configuration Manual

4.8.2

VRRP

4.8.2.1

VRRPv2

Router redundancy with VRRP
With the Virtual Router Redundancy Protocol (VRRP), the failure of a router in a network can
be countered.
VRRP can only be used with virtual IP interfaces (VLAN interfaces) and not with router ports.
Several VRRP routers in a network segment are put together as a logical group representing
a virtual router (VR). The group is defined using the virtual ID (VRID). Within the group, the
VRID must be the same. The VRID can no longer be used for other groups.
The virtual router is assigned a virtual IP address and a virtual MAC address. One of the VRRP
routers within the group is specified as the master router. The master router has priority 255.
The other VRRP routers are backup routers. The master router assigns the virtual IP address
and the virtual MAC address to its network interface. The master router sends VRRP packets
(advertisements) to the backup routers at specific intervals. With the VRRP packets, the master
router signals that it is still functioning. The master router also replies to the ARP queries.
If the virtual master router fails, a backup router takes over the role of the master router. The
backup router with the highest priority becomes the master router. If the priority of the backup
routers is the same, the higher MAC address decides. The backup router becomes the new
virtual master router.
The new virtual master router adopts the virtual MAC and IP address. This means that no
routing tables or ARP tables need to be updated. The consequences of a device failure are
therefore minimized.
You configure VRRP in "Layer 3 (IPv4) > VRRP (Page 364)".
4.8.2.2

VRRP3

Version 3 of VRRP is based on version 2.
Note
● Enable routing to be able to use VRRPv3.
● You can only use VRRPv3 in conjunction with VLAN interfaces. Router ports are not
supported.
● Simultaneous operation of VRRP and VRRPv3 is not possible.
● VRRPv3 supports IPv4 and IPv6. Both can be configured and operated at the same time
with VRRP3.
You configure VRRPv3 in:
IPv4: Layer 3 (IPv4 )> VRRPv3 (Page 372)
IPv6: Layer 3 (IPv6 )> VRRPv3 (Page 422)
SCALANCE XM-400/XR-500 Web Based Management (WBM)
Configuration Manual, 05/2017, C79000-G8976-C248-12
Technical basics
4.8 Routing function
59