GLBP Gateway load balancing protocol
GLBP or Gateway load balancing protocol is used for load
balancing and gateway redundancy in a network. Instead of giving actual MAC
addressed with the default gateway, the GLBP group provides virtual MAC to the
requesting hosts, which can be used further in creating network redundancy.
Some of the main components of GLBP are:
- Active Virtual Gateway
- Active Virtual Forwarder
Active virtual gateway takes care of all virtual MAC
assignments in the network. In case of its failure, active virtual forwarder
with second highest priority takes its place.
- GLBP uses 224.0.0.102 UDP/3222
- GLBP default Hello interval is 3 seconds
- GLBP has virtual MAC 0007.b4xx.xxyy with xx being group number and yy being forwarder number
- GLBP allows up to 4 virtual MAC address per group
- Elected Active Virtual Gateway (AVG) assigns/revokes virtual MAC to/from group members
- Each gateway is an Active Virtual Forwarder (AVF) and answers own ARP request
--to be continued--
Categories:
GLBP,
Load Balancing,
redundancy
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