Gateway Load Balancing Protocol - Revision history

Heth: Redirecting to GLBP

2009-05-04T05:05:30Z

Redirecting to GLBP

Heth: /* Timers */

2009-05-03T14:51:34Z

‎Timers

Heth: /* AVF - Active Virtual Forwarder */

2009-05-03T13:30:58Z

‎AVF - Active Virtual Forwarder

Heth: /* Timers */

2009-05-03T13:16:54Z

‎Timers

Heth: /* AVF - Active Virtual Forwarder */

2009-05-03T13:16:23Z

‎AVF - Active Virtual Forwarder

Heth: /* AVF - Active Virtual Forwarder */

2009-05-03T13:08:45Z

‎AVF - Active Virtual Forwarder

Heth: /* How does GLBP work */

2009-05-03T13:06:51Z

‎How does GLBP work

Heth: /* Purpose of GLBP */

2009-05-03T13:01:15Z

‎Purpose of GLBP

Heth: /* Purpose of GLBP */

2009-05-03T12:58:46Z

‎Purpose of GLBP

Heth: /* How does GLBP work */

2009-05-03T12:56:38Z

‎How does GLBP work

← Older revision		Revision as of 05:05, 4 May 2009
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.~~
−
−	~~: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.~~
−
−	~~= 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 =~~
−	{\|
−	\|
−	[[~~Image:GLBP1.png\|thumb\|500px\|float\|Picture 1: GLBP group with Router R1 as AVG and AVF and Router R2 and R3 as AVF]]~~
−	~~\|valign="top"\|~~
−	== GLBP ~~Roles ==~~
−	~~=== AVG - Active Virtual Gateway ===~~
−	~~The Router with the highest priority is chosen as the AVG. The AVG has the responsebility of assigning MAC addresses to the AVF Routers.~~
−	~~=== AVF - Active Virtual Forwarder ===~~
−	~~The AVF Routers Route traffic from the connected clients. Each AVF is assigned its own MAC-Address. The MAC-Address is assigned from the AVG.~~
−	~~=== Load Balancing ===~~
−	~~When the clients broadcast [[ARP]] requests to get the MAC Address of the default gateway - 10.0.0.1 - the AVG responds with a MAC-Address of one of the AVF's. load balancing can be either~~
−	* Round Robin: The AVG responds to ARP requests in sequence first AVF, second AVF, third AVF, first AVF.... (Default)
−	* Host dependent: Specifies a load balancing method based on the MAC address of a host where the same forwarder is always used for a particular host while the number of GLBP group members remains unchanged.
−	* Weighted: Specifies a load balancing method that is dependent on the weighting value advertised by the gateway.
−
−	~~=== Timers ===~~
−	~~Default the hello time for GLBP is 3 seconds and holdtime is 10 seconds. In the example hello time is set to 0.25 second and holdtime is 0.7 second.~~
−	\|}
−
−	{\|
−	\|
−	~~<pre>~~
−	~~hostname R1~~
−	!
−	~~interface FastEthernet1/0~~
−	~~ip address 10.0.0.11 255.0.0.0~~
−	~~glbp 7 ip 10.0.0.1~~
−	~~glbp 7 priority 130~~
−	~~glbp 7 timers msec 200 msec 700~~
−	~~</pre>~~
−	\|
−	~~<pre>~~
−	~~hostname R2~~
−	!
−	~~interface FastEthernet1/0~~
−	~~ip address 10.0.0.12 255.0.0.0~~
−	~~glbp 7 ip 10.0.0.1~~
−	~~glbp 7 priority 120~~
−	~~glbp 7 timers msec 200 msec 700~~
−	~~</pre>~~
−	\|
−	~~<pre>~~
−	~~hostname R3~~
−	!
−	~~interface FastEthernet1/0~~
−	~~ip address 10.0.0.13 255.0.0.0~~
−	~~glbp 7 ip 10.0.0.1~~
−	~~glbp 7 priority 110~~
−	~~glbp 7 timers msec 200 msec 700~~
−	~~</pre>~~
−	\|}
−
−	~~[[Category:Cisco]][[Category:CCNP]][[Category:IOS]][[Category:Network]][[Category:CCNP3]][[Category:IOS~~]]

← Older revision		Revision as of 14:51, 3 May 2009
Line 72:		Line 72:
	\|}		\|}

−	[[Category:Cisco]][[Category:CCNP]][[Category:IOS]][[Category:Network]][[Category:CCNP3]]	+	[[Category:Cisco]][[Category:CCNP]][[Category:IOS]][[Category:Network]][[Category:CCNP3]][[Category:IOS]]

@@ Line 29: / Line 29: @@
 === AVF - Active Virtual Forwarder ===
 The AVF Routers Route traffic from the connected clients. Each AVF is assigned its own MAC-Address. The MAC-Address is assigned from the AVG.
 === Timers ===
 Default the hello time for GLBP is 3 seconds and holdtime is 10 seconds. In the example hello time is set to 0.25 second and holdtime is 0.7 second.

@@ Line 51: / Line 51: @@
    ip address 10.0.0.12 255.0.0.0
    glbp 7 ip 10.0.0.1
-   glbp 7 priority 130
+   glbp 7 priority 120
    glbp 7 timers msec 200 msec 700
 </pre>
@@ Line 61: / Line 61: @@
    ip address 10.0.0.13 255.0.0.0
    glbp 7 ip 10.0.0.1
-   glbp 7 priority 130
+   glbp 7 priority 110
    glbp 7 timers msec 200 msec 700
 </pre>

@@ Line 29: / Line 29: @@
 === AVF - Active Virtual Forwarder ===
 The AVF Routers Route traffic from the connected clients. Each AVF is assigned its own MAC-Address. The MAC-Address is assigned from the AVG.
 |}

@@ Line 38: / Line 38: @@
 interface FastEthernet1/0
    ip address 10.0.0.11 255.0.0.0
-   standby 10 priority 130
+   glbp 7 ip 10.0.0.1
-  standby 10 preempt
+  glbp 7 priority 130
-  standby 10 timers 2 6
+  glbp 7 timers msec 200 msec 700
 </pre>
+|
@@ Line 49: / Line 48: @@
 interface FastEthernet1/0
    ip address 10.0.0.12 255.0.0.0
-   standby 10 priority 120
+   glbp 7 ip 10.0.0.1
-  standby 10 preempt
+  glbp 7 priority 130
-  standby 10 timers 2 6
+  glbp 7 timers msec 200 msec 700
 </pre>
+|
@@ Line 60: / Line 58: @@
 interface FastEthernet1/0
    ip address 10.0.0.13 255.0.0.0
-   standby 10 priority 110
+   glbp 7 ip 10.0.0.1
-  standby 10 preempt
+  glbp 7 priority 130
-  standby 10 timers 2 6
+  glbp 7 timers msec 200 msec 700
 </pre>
 |}
 [[Category:Cisco]][[Category:CCNP]][[Category:IOS]][[Category:Network]][[Category:CCNP3]]

@@ Line 21: / Line 21: @@
 = How does GLBP work =
 {|
-|-
 |valign="top"|
 == GLBP Roles ==
@@ Line 28: / Line 29: @@
 === AVF - Active Virtual Forwarder ===
 The AVF Routers Route traffic from the connected clients. Each AVF is assigned its own MAC-Address. The MAC-Address is assigned from the AVG.
+|
-[[Image:GLBP1.png|thumb|500px|float|Picture 1: GLBP group with Router R1 as AVG and AVF and Router R2 and R3 as AVF]]
+<pre>
 [[Category:Cisco]][[Category:CCNP]][[Category:IOS]][[Category:Network]][[Category:CCNP3]]

@@ Line 1: / Line 1: @@
 = Purpose of 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.
+: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 =