From Teknologisk videncenter
|
|
| (9 intermediate revisions by the same user not shown) |
| Line 1: |
Line 1: |
| − | = Purpose of GLBP =
| + | #Redirect [[GLBP]] |
| − | | |
| − | The purpose of GLBP is to ensure network connectivity in case of Router or access circuit failure. GLBP automatically Load balances the load from the IP traffic sources.
| |
| − | | |
| − | = Other high availability protocols
| |
| − | *HSRP [[Hot Standby Router Protocol]]
| |
| − | *VRRP [[Virtual Router Redundancy Protocol]]
| |
| − | | |
| − | = GLBP functions =
| |
| − | *Active virtual gateway (AVG): Members of a GLBP group elect one gateway to be the AVG for that group. Other group members provide backup for the AVG if the AVG becomes unavailable. The AVG assigns a virtual MAC address to each member of the group.
| |
| − | *Active virtual forwarder (AVF): Each gateway assumes responsibility for forwarding packets sent to the virtual MAC address assigned to it by the AVG. These gateways are known as AVFs for their virtual MAC address.
| |
| − | *Communication: GLBP members communicate with each other using hello messages sent every 3 seconds to the multicast address 224.0.0.102, User Datagram Protocol (UDP) port 3222.
| |
| − | | |
| − | = GLBP features =
| |
| − | *Load sharing: Traffic from LAN clients can be shared by multiple routers.
| |
| − | *Multiple virtual routers: Up to 1,024 virtual routers (GLBP groups) can be on each physical interface of a router, and there can be up to four virtual forwarders per group.
| |
| − | *Preemption: You can preempt an AVG with a higher priority backup virtual gateway. Forwarder preemption works in a similar way, except that it uses weighting instead of priority and is enabled by default.
| |
| − | *Efficient resource utilization: Any router in a group can serve as a backup, which eliminates the need for a dedicated backup router because all available routers can support network traffic.
| |
| − | = How does GLBP work =
| |
| − | {|
| |
| − | |-
| |
| − | |valign="top"|
| |
| − | Example
| |
| − | |
| |
| − | [[Image:GLBP1.png|thumb|500px|float|Picture 1: GLBP group with Router R1 as AVG and AVF and Router R2 and R3 as AVF]]
| |
| − | | |
| − | [[Category:Cisco]][[Category:CCNP]][[Category:IOS]][[Category:Network]][[Category:CCNP3]]
| |
Latest revision as of 06:05, 4 May 2009