Core Issue
Gateway Load Balancing Protocol (GLBP) is similar to Hot Standby Router Protocol (HSRP) and Virtual Router Redundancy Protocol (VRRP) in function, providing redundancy and load balancing for IP networks. This ensures that user traffic immediately and transparently recovers from first hop router failures. GLBP works by making use of a single virtual IP address that is configured as the default gateway on the hosts.
Beginning with Cisco IOS Software Release 12.2, the GLBP implementation has been modified by removing it from the IP routing process with which it was coupled earlier. It is now a separate process. When required, the IP routing process queries the GLBP process to find if the address is already in use by GLBP.
Resolution
GLBP generates the GLBP: API active virtual address x.x.x.x not found message if the x.x.x.x address being queried by the IP Routing process is not in use by GLBP. This message is seen if the debug glbp command is issued on the router. This is just an informational message indicating a normal situation, that GLBP is not already using the address being queried by the IP routing process, and it does not require any corrective action.
More Information
Debug glbp errors
To display debugging messages about Gateway Load Balancing Protocol (GLBP) error conditions, use the debug glbp errors command in privileged EXEC mode. To disable debugging output, use the no form of this command.
debug glbp errors
no debug glbp errors
Syntax Description
This command has no arguments or keywords.
Command Modes
Privileged EXEC
Command History
Release
Modification
| 12.2(14)S | This command was introduced. |
| 12.2(15)T | This command was integrated into Cisco IOS Release 12.2(15)T. |
Examples
The following is sample output from the debug glbp errors command:
Router# debug glbp errors
GLBP Errors debugging is on
1d19h: GLBP: Fa0/0 API active virtual address 10.21.8.32 not found
1d19h: GLBP: Fa0/0 API active virtual address 10.21.8.32 not found
1d19h: GLBP: Fa0/0 API active virtual address 10.21.8.32 not found
Command
Description
Related Commands
