GLBP (Gateway Load Balancing)
GLBP is a Cisco FHRP that provides redundancy and load balancing for default gateways.
Updated: 2026-03-06
Definition
GLBP (Gateway Load Balancing Protocol) allows multiple routers to share a virtual gateway while balancing client traffic.
It provides redundancy like HSRP/VRRP but can also distribute load across routers.
Key points
- Cisco proprietary FHRP
- Redundancy + load balancing
- Hosts use a single default gateway
Common mistakes
- Assuming all FHRPs load-balance by default (HSRP typically does not).
- Misunderstanding how load distribution is achieved (virtual MACs).
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