View source for CCNP 3 Implementing High Availability in a Campus Environment

=Configuring Layer 3 Redundancy with HSRP=
==Describing Routing Issues==
{|
|[[Image:ScreenShot415.jpg|800px|left|thumb|Default gateway fails]]
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|[[Image:ScreenShot416.jpg|800px|left|thumb|Standby takes over]]
|}
==Identifying the Router Redundancy Process==
{|
|[[Image:ScreenShot417.jpg|800px|left|thumb|Virtual Router]]
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|[[Image:ScreenShot418.jpg|800px|left|thumb|Standby takes over]]
|}
==Describing HSRP==
An HSRP group consists of the following:

*Active router
*Standby router
*Virtual router
*Other routers
<br/><br/>
HSRP active and standby routers send hello messages to the multicast address 224.0.0.2 using UDP port 1985.
==Identifying HSRP Operations==
{|
|[[Image:ScreenShot419.jpg|800px|left|thumb|HSRP operation]]
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|[[Image:ScreenShot420.jpg|800px|left|thumb|HSRP operation]]
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|[[Image:ScreenShot421.jpg|800px|left|thumb|HSRP operation]]
|-
|[[Image:ScreenShot422.jpg|800px|left|thumb|HSRP operation]]
|}
==Describing HSRP States==
{|
|[[Image:ScreenShot423.jpg|800px|left|thumb|HSRP States]]
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|[[Image:ScreenShot424.jpg|800px|left|thumb|HSRP State Descriptions]]
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|[[Image:ScreenShot425.jpg|800px|left|thumb|HSRP State Descriptions]]
|}
==Describing HSRP Configuration Commands==
{|
|[[Image:ScreenShot426.jpg|800px|left|thumb|HSRP Configuration Commands]]
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|[[Image:ScreenShot427.jpg|800px|left|thumb|HSRP Configuration Commands]]
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|[[Image:ScreenShot428.jpg|800px|left|thumb|HSRP Configuration Commands]]
|}
=Optimizing HSRP=
==Describing HSRP Optimization Options==
These options can be configured to optimize HSRP:
*Standby Priority
*Standby Preempt
*Message Timers
*Interface Tracking
{|
|[[Image:ScreenShot429.jpg|800px|left|thumb|HSRP Standby Priority]]
|-
|[[Image:ScreenShot430.jpg|800px|left|thumb|HSRP Stanby Preempt]]
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|[[Image:ScreenShot431.jpg|800px|left|thumb|HSRP Stanby Timers]]
|-
|[[Image:ScreenShot432.jpg|800px|left|thumb|HSRP Tracking]]
|}
===Configuration===
{|
|
<source lang=cli>
interface vlan 10
 ip address 10.0.0.2 255.255.255.0
 standby 1 ip 10.0.0.1
 standby 1 priority 150
 standby 1 preempt
 standby 1 preempt delay minimum 180
 standby 1 track GigabitEthernet 0/1 50
 standby 1 timers msec 200 msec 750
</source>
||
<source lang=cli>
interface vlan 10
 ip address 10.0.0.3 255.255.255.0
 standby 1 ip 10.0.0.1
 standby 1 priority 100
 standby 1 preempt
 standby 1 preempt delay minimum 180
 standby 1 track GigabitEthernet 0/1 50
 standby 1 timers msec 200 msec 750
</source>
|}

==Describing Load Sharing==
{|
|[[Image:ScreenShot433.jpg|800px|left|thumb|Multiple HSRP groups]]
|-
|[[Image:ScreenShot434.jpg|800px|left|thumb|HSRP Load Balancing]]
|}
=Configuring Layer 3 Redundancy with VRRP and GLBP=
==Describing Virtual Router Redundancy==
RFC 2338
{|
|[[Image:ScreenShot435.jpg|800px|left|thumb|VRRP]]
|-
|[[Image:ScreenShot436.jpg|800px|left|thumb|VRRP Operation]]
|}
==Configuring VRRP==
{|
|[[Image:ScreenShot437.jpg|800px|left|thumb|Configure VRRP]]
|}


==Describing GLBP==
{|
|[[Image:ScreenShot438.jpg|800px|left|thumb|GLBP]]
|}
'''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.<br/>
'''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.<br/>
'''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.
==Identifying the GLBP Operations Process==
{|
|[[Image:ScreenShot439.jpg|800px|left|thumb|GLBP operations]]
|-
|[[Image:ScreenShot440.jpg|800px|left|thumb|GLBP operations]]
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|[[Image:ScreenShot441.jpg|800px|left|thumb|GLBP operations]]
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|[[Image:ScreenShot442.jpg|800px|left|thumb|GLBP operations]]
|-
|[[Image:ScreenShot443.jpg|800px|left|thumb|GLBP Configuration]]
|}