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1.1 90. FHRP Services

The document discusses first hop redundancy protocols (FHRP) including an overview and details about Hot Standby Router Protocol (HSRP) and Virtual Router Redundancy Protocol (VRRP). It explains how FHRPs allow multiple routers to share a virtual IP address to provide a redundant default gateway for clients.

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iaas labs
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156 views7 pages

1.1 90. FHRP Services

The document discusses first hop redundancy protocols (FHRP) including an overview and details about Hot Standby Router Protocol (HSRP) and Virtual Router Redundancy Protocol (VRRP). It explains how FHRPs allow multiple routers to share a virtual IP address to provide a redundant default gateway for clients.

Uploaded by

iaas labs
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We take content rights seriously. If you suspect this is your content, claim it here.
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First Hop Redundancy Protocol

(FHRP)
KHAWAR BUTT
CCI E # 12353 [R/S, SECURI TY, SP, DC, V OI CE, STORAGE & CCDE]
Overview
 FHRP Overview
 HSRP
 VRRP c
Network Diagram
Internet
E 0/0 E 0/0
R2 R3
192.1.30.0/24

S 1/0

c
192.1.20.0/24

S 1/0

R1

E 0/0
192.168.10.0/24

E 0/0 E 0/0
PC3
R4 R5
PC1 PC2
E 0/1 E 0/1

192.168.20.0/24
FHRP Overview
 In order to provide redundancy between 2 switches, you connect 2 or more links
between them.
 Similarly to allow redundancy for your clients, you might want to connect 2
routers as exits from the networks. c
 The issue is that the PC’s (End-stations) will be configured with a single default
gateway address.
 FHRP technology allows the 2 routers to share a single IP Address. This shared
IP Address is commonly referred to as the Virtual IP or the VIP.
 You have the ability to prefer a specific router as the preferred Active router by
manipulating the FHRP priority of the Router.
 There are 2 main FHRP implementations, HSRP & VRRP.
Hot Standby Router Protocol
(HSRP)
 Hot Standby Router Protocol (HSRP) is a Cisco proprietary redundancy
protocol for establishing a fault-tolerant default gateway Redundancy.
 HSRP enables two or more devices c to work together in a group, sharing
a single IP address, the virtual IP address. The virtual IP address is
configured in each end user's workstation as a default gateway address
and is cached in the host's Address Resolution Protocol (ARP) cache.

 One router is elected to handle all requests sent to the virtual IP


address. This router is known as the active router.
 A HSRP group has one active router, at least one standby router, and
perhaps many listening routers.
Virtual Router Redundancy
Protocol (VRRP)
 Virtual Router Redundancy Protocol (VRRP) is an open standard
redundancy protocol for establishing a fault-tolerant default gateway
Redundancy.
c
 VRRP also enables two or more devices to work together in a group,
sharing a single IP address, the virtual IP address. The virtual IP
address is configured in each end user's workstation as a default
gateway address and is cached in the host's Address Resolution Protocol
(ARP) cache.
 One router is elected to handle all requests sent to the virtual IP
address. This router is known as the Master router.
 A VRRP group has one master router and one or more backup routers.
Whiteboard

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