What is AVG in GLBP?

What is AVG in GLBP?

All devices running GLBP elect an AVG (Active Virtual Gateway). There will be only one AVG for a single group running GLBP but other devices can take over this rule if the AVG fails. The role of the AVG is to assign a virtual MAC address to all other devices running GLBP.

What are the two main purposes of the AVG active virtual gateway in GLBP?

AVG role is used to load-balance and respond to ARP requests. AVF role manages one or more virtual MACs and is responsible for packet forwarding. AVG redundancy is controlled by GLBP priority and AVF redundancy is implemented using AVF weight value and two additional timers.

Is GLBP Cisco proprietary?

Gateway Load Balancing Protocol (GLBP) is a Cisco proprietary protocol that attempts to overcome the limitations of existing redundant router protocols by adding basic load balancing functionality. By default, GLBP load balances in round-robin fashion. GLBP elects one AVG (Active Virtual Gateway) for each group.

What is the difference between HSRP and GLBP?

The main difference is that GLBP allows the load balancing of traffic among the master and standby routers while in HSRP (and VRRP) the standby routers do not help handle traffic. With GLBP, the single virtual IP address is associated with one virtual MAC address per GLBP member.

What is the benefit of Glbp?

GLBP Benefits GLBP supports up to 1024 virtual routers (GLBP groups) on each physical interface of a router, and up to 4 virtual forwarders per group. The redundancy scheme of GLBP enables you to preempt an active virtual gateway with a higher priority backup virtual gateway that has become available.

How do I check my Glbp status?

Virtual Gateway Redundancy : To detect a gateway failure, GLBP members communicate with each other through hello messages, sent in every 3-seconds to the multicast address 224.0. 0.102. If AVG fails, then the AVF having highest priority will become the AVG i.e responsible for providing the Mac address of AVFs.

How does Glbp load balancing?

GLBP load Balancing :

1. Round-Robin : AVG will assign the virtual Mac addresses serial wise, like first virtual Mac address is assigned to AVF1, then to AVF2 etc.
2. Host-dependent : If particular host needs specific virtual Mac address every time then specific AVF is assigned to the hosts by the AVG.

Why would you use Glbp over HSRP and VRRP?

Why would you prefer GLBP over HSRP and VRRP? GLBP provides load-balancing within a single subnet. GLBP uses a virtual IP address while HSRP and VRRP use physical IP addresses. GLBP is easy to configure as GLBP configuration is provided to hosts through DHCP.

What is Glbp networking?

Gateway Load Balancing Protocol (GLBP) protects data traffic from a failed router or circuit, like Hot Standby Router Protocol (HSRP) and Virtual Router Redundancy Protocol (VRRP), while allowing packet load sharing between a group of redundant routers.

How do I configure Glbp?

Enable GLBP authentication using the configured key chain and group number of 1. Change the default GLBP load balancing behavior to using weighting. Exit into global configuration mode. Create a tracked object that will monitor the line protocol status of the fa0/0 interface using an object number of 1.

What are the benefits of Glbp?

Is VRRP better than HSRP?

As you can see there sin’t a big difference between the two protocols. The primary difference between HSRP versus VRRP would be that HSRP is proprietary to Cisco and can only be used on Cisco devices. VRRP is a standards based protocol and is vendor independent allow some flexibility when choosing network devices.

What is the difference between avg and AVF for GLBP?

In Figure 1, Router A is the AVG for a GLBP group, and is responsible for the virtual IP address 10.21.8.10. Router A is also an AVF for the virtual MAC address 0007.b400.0101. Router B is a member of the same GLBP group and is designated as the AVF for the virtual MAC address 0007.b400.0102.

How does Avg assign MAC addresses to GLBP groups?

The AVG assigns a virtual MAC address to each member of the GLBP group. Each gateway assumes responsibility for forwarding packets sent to the virtual MAC address assigned to it by the AVG.

What is the maximum number of virtual routers supported by GLBP?

GLBP supports up to 1024 virtual routers (GLBP groups) on each physical interface of a router, and up to 4 virtual forwarders per group. The redundancy scheme of GLBP enables you to preempt an active virtual gateway with a higher priority backup virtual gateway that has become available.

What is the state of the GLBP router in Linux?

(Optional) State of the GLBP router, one of the following: active, disabled, init, listen, speak, or standby . (Optional) Summarizes each virtual gateway or virtual forwarder with a single line of output. This command was introduced. Use the show glbp command to display information about GLBP groups on a router.