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.

Author: Tojalabar Tygozilkree
Country: Malta
Language: English (Spanish)
Genre: Spiritual
Published (Last): 11 March 2015
Pages: 331
PDF File Size: 9.57 Mb
ePub File Size: 2.38 Mb
ISBN: 581-5-53368-248-1
Downloads: 79848
Price: Free* [*Free Regsitration Required]
Uploader: Nebar

It cannot switch to an alternate gateway even if one exists until an administrator manually re-configures the default gateway on the host. Change the default GLBP load balancing behavior to using weighting. The election is based on the priority of each gateway highest priority wins. In other words, the bandwidth of standby routers is not utilized and goes waste. The virtual IP address of the virtual router is then configured gutorial LAN clients as their default gateway. These protocols protect against a single point of failure for the default gateway and may also provide load balancing if multiple uplinks are available at first-hop routers.

We will cover these three protocols in upcoming sections of the chapter. R2 config-if glbp 1 load-balancing weighted. R1 configure terminal Enter configuration commands, one per line. What will happen now? These advertisements are sent, every second by default, as multicasts to the standard multicast address See All Related Store Items. The routers participating in GLBS communicate with each other through hello messages sent every 3 seconds to the multicast address The figure below shows a basic topology in which VRRP is configured.

R1 config-keychain-key key-string test-string. In this article, networking consultant Sean Wilkins takes the concepts covered in his earlier ” Introduction to GLBP ” article and discusses how those concepts can be applied to real devices. If all of them have the same priority then the gateway with the highest real IP address becomes the AVG. The line-protocol parameter will track the protocol state of the configured interface.


R2 configure terminal Enter configuration commands, one per line. The second router then becomes primary. If the virtual router master fails, the virtual router backup configured with the highest priority will become the virtual router master.

CCNA Training » Gateway Load Balancing Protocol GLBP Tutorial

It is time for verification using the show standby command. Tables 2 and 3 show the basic commands that are required to configure GLBP between the two devices shown in Figure 1. Table 4 covers all the commands that are required to perform these steps.

Futorial valid values for the priority are from 1 through But only one member of the group is elected as the active router that forwards packets sent to the virtual IP address for the group. There can be multiple virtual router backups, though in tuforial figure above routers R2 and R3 are virtual router backups.

See Tables 5 and 6 for examples.

GLBP (Gateway Load Balancing Protocol) |

Syslog Tutorial Access list Sim 1 Simulator. The IP address of the virtual router is the same as that configured on the Ethernet interface of R1 If the router R1 becomes unavailable, the backup with higher priority, that is R2should assume the role of master.

I need to access CCNA security. To detect a gateway failure, GLBP members communicate between each other through hello messages sent every 3 seconds to the multicast address The object-number can be any number between 1 and For example, if there are two routers in a group and R1 has double gllbp forwarding capacity of router B, the weighting value of rutorial A should be configured to be double the amount of R2. If there are multiple routers acting as virtual router backup, the one with the highest priority becomes the virtual router master if the original virtual router master fails.


At the other side, the same key is also encrypted and compared with the receiving encrypted key. Because the virtual router uses the IP address of the physical Ethernet interface of R1, R1 assumes the role of virtual router master. R1 config-if glbp 1 track 1 decrement Hi guys, can someone send the latest dumps my way plz??

14-1 High Availability – VRRP, HSRP, GLBP

One end will send the tutorizl key called hash, using MD5 to the other. R2 config-if glbp 1 track 1 decrement The other router or routers become standby and take over if the active router fails. Create a tracked object.

The router R2 is configured with the default priority In this case we only have four gateways so surely they are all elected AVFs. R1 config-if glbp 1 load-balancing weighted. Other members of the group provide backup for the AVG if it goes down.

I hope that this article provided some insight into the configuration steps tutlrial are required to configure GLBP and get it up and running. These include GLBP timers helloholdredirect and timeoutaltering the default load balancing behavior the default is round robinconfiguring GLBP authentication, and basic interface tracking.

The key-number can be any number tjtorial You can configure the priority of each virtual router backup with a value of 1 through using vrrp priority command. R4 assigned the MAC addresses of