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 7: Link Layer Discovery Protocol 129
LLDP Transmit Features
Numerous LLDP transmit options are available, including scheduled and minimum transmit
interval, expiration on remote systems, SNMP trap notification, and the types of information
permitted to be shared.
Scheduled Interval
The GbE2c can be configured to transmit LLDP information to neighboring devices once each 5 to
32768 seconds. The scheduled interval is global; the same interval value applies to all LLDP
transmit-enabled ports. However, to help balance LLDP transmissions and keep them from being
sent simultaneously on all ports, each port maintains its own interval clock, based on its own
initialization or reset time. This allows switch-wide LLDP transmissions to be spread out over time,
though individual ports comply with the configured interval.
The global transmit interval can be configured using the following command:
where interval is the number of seconds between LLDP transmissions. The range is 5 to 32768. The
default is 30 seconds.
Minimum Interval
In addition to sending LLDP information at scheduled intervals, LLDP information is also sent
when the GbE2c detects relevant changes to its configuration or status (such as when ports are
enabled or disabled). To prevent the GbE2c from sending multiple LLDP packets in rapid
succession when port status is in flux, a transmit delay timer can be configured.
The transmit delay timer represents the minimum time permitted between successive LLDP
transmissions on a port. Any interval-driven or change-driven updates will be consolidated until the
configured transmit delay expires.
The minimum transmit interval can be configured using the following command:
where interval is the minimum number of seconds permitted between successive LLDP
transmissions on any port. The range is 1 to one-quarter of the scheduled transmit interval
(msgtxint), up to 8192. The default is 2 seconds.
>> # /cfg/l2/lldp/msgtxint <interval>
>> # /cfg/l2/lldp/txdelay <interval>