BLADE OS™ Application Guide HP GbE2c Ethernet Blade Switch for c-Class BladeSystem Version 5.1 Advanced Functionality Software
Table Of Contents
- Contents
- Figures
- Tables
- Preface
- Part 1: Basic Switching
- Accessing the Switch
- The Management Network
- Local Management Using the Console Port
- The Command Line Interface
- Remote Management Access
- Client IP Address Agents
- Securing Access to the Switch
- Setting Allowable Source IP Address Ranges
- RADIUS Authentication and Authorization
- TACACS+ Authentication
- LDAP Authentication and Authorization
- Secure Shell and Secure Copy
- Configuring SSH/SCP Features on the Switch
- Configuring the SCP Administrator Password
- Using SSH and SCP Client Commands
- SSH and SCP Encryption of Management Messages
- Generating RSA Host and Server Keys for SSH Access
- SSH/SCP Integration with Radius Authentication
- SSH/SCP Integration with TACACS+ Authentication
- End User Access Control
- Ports and Trunking
- Port-Based Network Access Control
- VLANs
- Spanning Tree Protocol
- RSTP and MSTP
- Link Layer Discovery Protocol
- Quality of Service
- Accessing the Switch
- Part 2: IP Routing
- Basic IP Routing
- Routing Information Protocol
- IGMP
- OSPF
- OSPF Overview
- OSPF Implementation in BLADE OS
- OSPF Configuration Examples
- Remote Monitoring
- Part 3: High Availability Fundamentals
- High Availability
- Layer 2 Failover
- Server Link Failure Detection
- VRRP Overview
- Failover Methods
- BLADE OS Extensions to VRRP
- Virtual Router Deployment Considerations
- High Availability Configurations
- High Availability
- Part 4: Appendices
- Index
BLADE OS 5.1 Application Guide
BMD00113, September 2009 Chapter 12: OSPF 205
Host Routes for Load Balancing
BLADE OS implementation of OSPF includes host routes. Host routes are used for advertising
network device IP addresses to external networks, accomplishing the following goals:
ABR Load Sharing
As a form of load balancing, host routes can be used for dividing OSPF traffic among multiple
ABRs. To accomplish this, each switch provides identical services but advertises a host route
for a different IP address to the external network. If each IP address serves a different and equal
portion of the external world, incoming traffic from the upstream router should be split evenly
among ABRs.
ABR Failover
Complementing ABR load sharing, identical host routes can be configured on each ABR.
These host routes can be given different costs so that a different ABR is selected as the
preferred route for each server and the others are available as backups for failover purposes.
Equal Cost Multipath (ECMP)
With equal cost multipath, a router potentially has several available next hops towards any
given destination. ECMP allows separate routes to be calculated for each IP Type of Service.
All paths of equal cost to a given destination are calculated, and the next hops for all equal-cost
paths are inserted into the routing table.
If redundant routes via multiple routing processes (such as OSPF, RIP, BGP, or static routes) exist
on your network, the switch defaults to the OSPF-derived route.
OSPF Features Not Supported in This Release
The following OSPF features are not supported in this release:
Summarizing external routes
Filtering OSPF routes
Using OSPF to forward multicast routes
Configuring OSPF on non-broadcast multi-access networks (such as frame relay, X.25, and
ATM )