User manual
Table Of Contents
- Introduction
- Product Overview
- Installation and Quick Startup
- Package Contents
- Switch Installation
- Installing the Switch in a Rack
- Quick Starting the Switch
- System Information Setup
- Quick Start up Software Version Information
- Quick Start up Physical Port Data
- Quick Start up User Account Management
- Quick Start up IP Address
- Quick Start up Uploading from Switch to Out-of-Band PC
- Quick Start up Downloading from Out-of-Band PC to Switch
- Quick Start up Downloading from TFTP Server
- Quick Start up Factory Defaults
- Console and Telnet Administration Interface
- Web-Based Management Interface
- Command Line Interface Structure and Mode-based CLI
- Switching Commands
- System Information and Statistics commands
- Device Configuration Commands
- Interface
- L2 MAC Address and Multicast Forwarding Database Tables
- VLAN Management
- Double VLAN commands
- GVRP and Bridge Extension
- IGMP Snooping
- IGMP Snooping Querier
- MLD Snooping
- MLD Snooping Querier
- Port Channel
- Storm Control
- L2 Priority
- Port Mirror
- Link State
- Port Backup
- FIP Snooping
- Enhanced Transmission Selection (ETS)
- Congestion Notification
- Management Commands
- Spanning Tree Commands
- System Log Management Commands
- Script Management Commands
- User Account Management Commands
- Security Commands
- CDP (Cisco Discovery Protocol) Commands
- SNTP (Simple Network Time Protocol) Commands
- MAC-Based Voice VLAN Commands
- LLDP (Link Layer Discovery Protocol) Commands
- Denial Of Service Commands
- VTP (VLAN Trunking Protocol) Commands
- Protected Ports Commands
- Static MAC Filtering Commands
- System Utilities
- DHCP Snooping Commands
- IP Source Guard (IPSG) Commands
- Dynamic ARP Inspection (DAI) Command
- Differentiated Service Command
- ACL Command
- IPv6 ACL Command
- CoS (Class of Service) Command
- Domain Name Server Relay Commands
- Routing Commands
- IP Multicast Commands
- IPv6 Commands
- Web-Based Management Interface
- Overview
- System Menu
- View ARP Cache
- Viewing Inventory Information
- Configuring Management Session and Network Parameters
- Defining Forwarding Database
- Viewing Logs
- Managing Switch Interface
- Defining sFlow
- Defining SNMP
- Viewing Statistics
- Managing System Utilities
- Managing CDP Function
- Defining Trap Manager
- Configuring SNTP
- Defining DHCP Client
- Defining DNS Relay Function
- Switching Menu
- Managing DHCP Snooping
- Managing IP Source Guard (IPSG)
- Managing Dynamic ARP Inspection (DAI)
- Managing Filters
- Managing Port-based VLAN
- Managing Protected Ports
- Managing Protocol-based VLAN
- Managing IP Subnet-based VLAN
- Managing MAC-based VLAN
- Managing MAC-based Voice VLAN
- Managing Voice VLAN
- Defining GARP
- Managing IGMP Snooping
- Managing IGMP Snooping Querier
- Managing MLD Snooping
- Managing MLD Snooping Querier
- Managing Port-Channel
- Viewing Multicast Forwarding Database
- Managing Spanning Tree
- Defining 802.1p priority
- Managing Port Security
- Managing LLDP
- Managing LLDP-MED
- Managing VTP
- Managing Link State
- Managing Port-Backup
- Managing FIP-Snooping
- Routing Menu
- Security Menu
- IPv6 Menu
- Configuring IPv6 Global Configuration Page
- Configuring IPv6 Interface Configuration Page
- Viewing IPv6 Interface Summary Page
- Viewing IPv6 Interface Statistics Page
- Viewing IPv6 Neighbor Table Information Page
- Viewing IPv6 Static Neighbor Table Information Page
- Managing OSPFv3 Protocol
- Managing IPv6 Routes
- Managing RIPv6
- QOS Menu
- IPv4 Multicast Menu
- IPv6 Multicast Menu
- 456 -
Router OSPF Config Mode
8.3.2.22 auto-cost
By default, OSPF computes the link cost of each interface from the interface bandwidth. Faster links have
lower metrics,making them more attractive in route selection. The configuration parameters in the
auto-cost reference bandwidth and bandwidth commands give you control over the default link cost.
You can configure for OSPF an interface bandwidth that is independent of the actual link speed. A second
configuration parameter allows you to control the ratio of interface bandwidth to link cost. The link cost is
computed as the ratio of a reference bandwidth to the interface bandwidth (ref_bw /interface bandwidth),
where interface bandwidth is defined by the bandwidth command. Because the default reference
bandwidth is 100 Mbps, OSPF uses the same default link cost for all interfaces whose bandwidth is 100
Mbps or greater. Use the auto-cost command to change the reference bandwidth, specifying the
reference bandwidth in megabits per second (Mbps). The reference bandwidth range is 1-4294967 Mbps.
The different reference bandwidth can be independently configured for OSPFv2 and OSPFv3.
Use no auto-cost command to set the reference bandwidth to the default value.
Syntax
auto-cost reference-bandwidth <1 to 4294967>
no auto-cost reference-bandwidth
Default Setting
100Mbps
Command Mode
Router OSPF Config Mode
8.3.2.23 bandwidth
By default, OSPF computes the link cost of an interface as the ratio of the reference bandwidth to the
interface bandwidth. Reference bandwidth is specified with the auto-cost command. For the purpose of
the OSPF link cost calculation, use the bandwidth command to specify the interface bandwidth. The
bandwidth is specified in kilobits per second. If no bandwidth is configured, the bandwidth defaults to the
actual interface bandwidth for port-based routing interfaces and to 10 Mbps for VLAN routing interfaces.
This command does not affect the actual speed of an interface. Use no bandwidth command to set the
interface bandwidth to its default value
Syntax
bandwidth <1-10000000>
no bandwidth
Default Setting
Actual interface bandwidth
Command Mode