Cisco How-To Tutorials The Gateway Load Balancing Protocol (GLBP) feature was integrated into Cisco IOS Software Release (15)T. There are two methods a LAN host can determine its default gateway or first-hop router. The first method uses a dynamic process such as a. GLBP is a Cisco proprietary protocol which was made available in . I’ve been following your two previous tutorials on HSRP and VRRP.
|Published (Last):||15 March 2011|
|PDF File Size:||18.40 Mb|
|ePub File Size:||16.24 Mb|
|Price:||Free* [*Free Regsitration Required]|
GLBP preemption is disabled by default. There can be multiple virtual router backups, though in the figure above routers R2 and R3 are virtual router backups. The highest priority assignment to R1 is a consequence of using the physical IP address of R1 as the virtual group IP address.
Enable GLBP authentication using the configured key chain and group number of 1. The virtual router is made up of a single router acting as virtual router master and multiple routers acting as virtual router backup. At the other side, the same key is also encrypted and compared with the receiving encrypted key. Because of this, a number of different technologies have been developed to provide redundancy at every point within the network.
What will happen now? These include Tutlrial timers helloholdredirect and timeoutaltering the default load balancing behavior the default is round robinconfiguring GLBP authentication, and basic interface tracking.
GLBP (Gateway Load Balancing Protocol) |
It cannot switch to an alternate gateway even if one exists until an administrator manually re-configures the default gateway on the host. As a result, client hosts on the LAN receive uninterrupted connectivity through their default gateway The alternative to using a dynamic discovery protocol is to statically configure a default gateway on the host.
R2 config-if ip address Client 1 has a default gateway of The virtual router master is also known as the IP address owner. Because the virtual router uses the IP address of the physical Ethernet interface of R1, R1 assumes the role of virtual router master. The other routers in the standby group are just sitting there watching the show, until the active router fails. The election is based on the priority of each gateway highest priority wins. But the trick here is it does not always give the same answer to that question:.
R4 assigned the MAC addresses of If the virtual router master fails, the virtual router backup configured with the highest priority will become the virtual router master.
VRRP router preemption allows a virtual router backup with a higher priority that comes up to take over the virtual router backup that was elected to become the virtual router master.
R2 configure terminal Enter configuration commands, one per line. R1 config-if glbp 1 load-balancing weighted. Hi please can anyone assist with the latest dumps?
The valid values for the priority are from 1 through Load balancing algorithm GLBP load sharing is done in one of three ways: For example, if there are two tutoriwl in a group and R1 has double the forwarding capacity of router B, the weighting value of router A should be configured to be double the amount of R2.
Configure the GLBP redirect timers.
GLBP (Gateway Load Balancing Protocol)
Configure GLBP to use the tracked object to influence its weighting. These two versions of HSRP are not compatible with each other. Related Resources Store Articles Blogs.
You may verify GLBP configuration and find out which role each router is playing using the show glbp command. The problem with HSRP really is that only one router is active at one time.
These protocols protect against a single point of failure for the glnp gateway and may also provide load balancing if multiple uplinks are available at first-hop routers.
Tables 2 and 3 show the basic commands that are required to configure GLBP between the two devices shown in Figure 1.
This section covers a simple example of how GLBP can be configured in a basic common topology. A host configured with a static default gateway is isolated if the gateway fails.
These messages communicate HSRP parameters to other members of the group and also serve as a keep alive. Syslog Tutorial Access list Sim 1 Simulator.