Module 9: HSRP Configuration Study Notes

Module 9: HSRP Configuration

Introduction to HSRP

  • HSRP: Hot Standby Router Protocol, designed to provide redundancy for IP network routing.
  • Objective: Configure a redundant gateway using HSRP.

Equipment Needed

  • Routers: Two 2901 routers.
  • Switches: Two 2960 switches.
  • PCs: Three PCs.
  • Cables: Straight-through cables.

Network Configuration Overview

  • Networks:   - First Network: 192.168.10.0/24     - Default Gateway: 192.168.10.1 (Router 1)   - Second Network: 172.16.0.0/24     - Default Gateway: 172.16.0.1 (Router 2)
  • IP Address Assignments:   - PC1: 192.168.10.2   - PC2: 192.168.10.3   - PC3: 172.16.0.3

Physical Setup

  • Connect routers and switches:   - Ports used can vary (e.g., G0/0, G0/1).
  • For example: Connect Router 1 G0/0 to Switch 1, Router 2 G0/0 to Switch 2.

PC Configuration Steps

  1. Assign IP addresses to PCs according to the network structure (e.g., PC1: 192.168.10.2).
  2. Configure default gateways:    - For PCs in the 192.168.10.0 network, set the default gateway to 192.168.10.3 (the virtual HSRP gateway).    - For PCs in the 172.16.0.0 network, set the default gateway to 172.16.0.2.

Router Configuration

Router 1 Configuration
  • Enter configuration mode:   - enable   - config t
  • Disable IP domain lookup:   - no ip domain lookup
  • Set hostname:   - hostname Router1
  • Configure interface G0/0:   - interface G0/0   - ip address 192.168.10.1 255.255.255.0   - standby 1 ip 192.168.10.3   - standby 1 priority 150   - standby 1 preempt   - no shutdown
  • Configure interface G0/1 (for the second network):   - interface G0/1   - ip address 172.16.0.100 255.255.255.0   - no shutdown
Router 2 Configuration
  • Enter configuration mode:   - enable   - config t
  • Disable IP domain lookup:   - no ip domain lookup
  • Set hostname:   - hostname Router2
  • Configure interface G0/0:   - interface G0/0   - ip address 192.168.10.2 255.255.255.0   - standby 1 ip 192.168.10.3
      - (default priority is 100)
  • Configure interface G0/1 (for the second network):   - interface G0/1   - ip address 172.16.0.101 255.255.255.0   - no shutdown

Testing HSRP Functionality

PC Testing
  1. From PC1, ping the virtual IP address:    - ping 192.168.10.3
  2. Verify connectivity through both routers:    - Use the command tracert 172.16.0.101 to observe routing paths.
Simulating Link Failure
  • Disconnect the link from Router 1 to observe automatic failover to Router 2:   - Router 2 should take over as the active router after detecting the failure.
  • Re-ping PC2 after the link is disabled:    - ping 172.16.0.101
  • Trace route again to verify new routing path:    - tracert 172.16.0.101

Conclusion

  • HSRP allows for seamless failover between routers, ensuring continuous network availability.
  • HSRP configuration is crucial for maintaining network redundancy.
  • Suggested additional protocols for consideration include GLBP (Gateway Load Balancing Protocol) which utilizes both routers to balance traffic load.