Contents
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Time Protocols -
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General steps for running a time protocol on the switch -
Selecting a time synchronization protocol -
Disabling time synchronization -
SNTP: Selecting and configuring -
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Viewing and configuring SNTP (Menu) -
Viewing and configuring SNTP (CLI) -
SNTP client authentication -
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Requirements -
Configuring the key-identifier, authentication mode, and key-value (CLI) -
Configuring a trusted key -
Associating a key with an SNTP server (CLI) -
Enabling SNTP client authentication -
Configuring unicast and broadcast mode for authentication -
Viewing SNTP authentication configuration information (CLI) -
Saving configuration files and the include-credentials command
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TimeP: Selecting and configuring -
SNTP unicast time polling with multiple SNTP servers -
Operating with multiple SNTP server addresses configured (Menu) -
SNTP messages in the Event Log -
Monitoring resources
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Port Status and Configuration -
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Viewing port status and configuring port parameters -
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Connecting transceivers to fixed-configuration devices -
Viewing port configuration (Menu) -
Viewing port status and configuration (CLI) -
Customizing the show interfaces command (CLI) -
Viewing port utilization statistics (CLI) -
Viewing transceiver status (CLI) -
Enabling or disabling ports and configuring port mode (CLI) -
Enabling or disabling flow control (CLI) -
Port shutdown with broadcast storm -
Configuring auto-MDIX
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Using friendly (optional) port names -
Uni-directional link detection (UDLD) -
Uplink failure detection
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Power Over Ethernet (PoE/PoE+) Operation -
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Introduction to PoE -
PoE operation -
Configuring PoE operation -
PoE/PoE+ allocation using LLDP information -
Viewing the global PoE power status of the switch -
Using the HP 2920 Switch with an external power supply -
Planning and implementing a PoE configuration -
PoE Event Log messages
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Port Trunking -
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Overview of port trunking -
Port trunk features and operation -
Trunk configuration methods -
Viewing and configuring a static trunk group (Menu) -
Viewing and configuring port trunk groups (CLI) -
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Viewing static trunk type and group for all ports or for selected ports -
Viewing static LACP and dynamic LACP trunk data -
Dynamic LACP Standby Links -
Configuring a static trunk or static LACP trunk group -
Removing ports from a static trunk group -
Enabling a dynamic LACP trunk group -
Removing ports from a dynamic LACP trunk group
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Viewing existing port trunk groups (WebAgent) -
Trunk group operation using LACP -
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Default port operation -
LACP notes and restrictions -
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802.1X (Port-based access control) configured on a port -
Port securityconfigured on a port -
Changing trunking methods -
Static LACP trunks -
Dynamic LACP trunks -
VLANs and dynamic LACP -
Blocked ports with older devices -
Spanning Tree and IGMP -
Half-duplex, different port speeds, or both not allowed in LACP trunks -
Dynamic/static LACP interoperation
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Trunk group operation using the "trunk" option -
How the switch lists trunk data -
Outbound traffic distribution across trunked links -
Trunk load balancing using port layers
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Port Traffic Controls -
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Rate-limiting -
ICMP rate-limiting -
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Guidelines for configuring ICMP rate-limiting -
Configuring ICMP rate-limiting -
Using both ICMP rate-limiting and all-traffic rate-limiting on the same interface -
Viewing the current ICMP rate-limit configuration -
Operating notes for ICMP rate-limiting -
ICMP rate-limiting trap and Event Log messages -
Configuring inbound rate-limiting for broadcast and multicast traffic
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Configuring egress per-queue rate-limiting (2920, 3800, and 5400R switches only) -
Guaranteed minimum bandwidth (GMB) -
Jumbo frames
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Configuring for Network Management Applications -
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Using SNMP tools to manage the switch -
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SNMP management features -
SNMPv1 and v2c access to the switch -
SNMPv3 access to the switch -
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Enabling and disabling switch for access from SNMPv3 agents -
Enabling or disabling restrictions to access from only SNMPv3 agents -
Enabling or disabling restrictions from all non-SNMPv3 agents to read-only access -
Viewing the operating status of SNMPv3 -
Viewing status of message reception of non-SNMPv3 messages -
Viewing status of write messages of non-SNMPv3 messages -
Enabling SNMPv3 -
SNMPv3 users -
Group access levels -
SNMPv3 communities -
Viewing and configuring non-version-3 SNMP communities (Menu) -
Listing community names and values (CLI)
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SNMP notifications -
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Supported Notifications -
General steps for configuring SNMP notifications -
SNMPv1 and SNMPv2c Traps -
SNMP trap receivers -
SNMP trap when MAC address table changes -
SNMPv2c informs -
Configuring SNMPv3 notifications (CLI) -
Network security notifications -
Enabling Link-Change Traps (CLI) -
Source IP address for SNMP notifications -
Viewing SNMP notification configuration (CLI)
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Configuring the MAC address count option -
Advanced management: RMON -
CLI-configured sFlow with multiple instances
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Configuring UDLD Verify before forwarding -
LLDP -
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General LLDP operation -
Packet boundaries in a network topology -
LLDP operation configuration options -
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Enable or disable LLDP on the switch -
Enable or disable LLDP-MED -
Change the frequency of LLDP packet transmission to neighbor devices -
Change the Time-To-Live for LLDP packets sent to neighbors -
Transmit and receive mode -
SNMP notification -
Per-port (outbound) data options -
Remote management address -
Debug logging
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Options for reading LLDP information collected by the switch -
LLDP and LLDP-MED standards compatibility -
LLDP operating rules -
Configuring LLDP operation -
Port VLAN ID TLV support on LLDP -
LLDP-MED (media-endpoint-discovery) -
Viewing switch information available for outbound advertisements -
LLDP Operating Notes -
LLDP and CDP data management -
Configuring CDPv2 for voice transmission -
Filtering CDP information -
Filtering PVID mismatch log messages
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DHCPv4 server -
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Introduction to DHCPv4 -
IP pools -
DHCP options -
BootP support -
Authoritative server and support for DHCP inform packets -
Authoritative pools -
Authoritative dummy pools -
Change in server behavior -
DHCPv4 configuration commands -
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Enable/disable the DHCPv4 server -
Configuring the DHCP address pool name -
Authoritative -
Specify a boot file for the DHCP client -
Configure a default router for a DHCP client -
Configure the DNS IP servers -
Configure a domain name -
Configure lease time -
Configure the NetBIOS WINS servers -
Configure the NetBIOS node type -
Configure subnet and mask -
Configure DHCP server options -
Configure the range of IP address -
Configure the static binding information -
Configure the TFTP server domain name -
Configure the TFTP server address -
Change the number of ping packets -
Change the amount of time -
Configure DHCP Server to save automatic bindings -
Configure a DHCP server to send SNMP notifications -
Enable conflict logging on a DHCP server -
Enable the DHCP server on a VLAN -
Clear commands -
Reset all DHCP server and BOOTP counters -
Delete an automatic address binding
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Show commands -
Event log
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Link Aggregation Control Protocol—Multi-Active Detection (LACP-MAD) -
Scalability IP Address VLAN and Routing Maximum Values -
File Transfers -
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Overview -
Downloading switch software -
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General software download rules -
Using TFTP to download software from a server -
Using SCP and SFTP -
Enabling SCP and SFTP -
Using Xmodem to download switch software from a PC or UNIX workstation -
Using USB to transfer files to and from the switch -
Switch-to-switch download -
Using IMC to update switch software
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Copying software images -
Transferring switch configurations -
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TFTP: Copying a configuration file to a remote host (CLI) -
TFTP: Copying a configuration file from a remote host (CLI) -
TFTP: Copying a customized command file to a switch (CLI) -
Xmodem: Copying a configuration file to a serially connected PC or UNIX workstation (CLI) -
Xmodem: Copying a configuration file from a serially connected PC or UNIX workstation (CLI) -
USB: Copying a configuration file to a USB device (CLI) -
USB: Copying a configuration file from a USB device (CLI)
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Transferring ACL command files -
Single copy command -
USB: Uploading an ACL command file from a USB device (CLI) -
Copying diagnostic data to a remote host, USB device, PC or UNIX workstation -
Flight Data Recorder (FDR) -
Using USB autorun
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Monitoring and Analyzing Switch Operation -
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Overview -
Status and counters data -
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Accessing status and counters (Menu) -
General system information -
Collecting processor data with the task monitor (CLI) -
Task usage reporting -
Switch management address information -
Port Status -
Port and trunk group statistics and flow control status -
Viewing the switch's MAC address tables -
Accessing MSTP Data (CLI) -
Viewing internet IGMP status (CLI) -
Viewing VLAN information (CLI) -
WebAgent status information
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Interface monitoring features
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Troubleshooting -
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Overview -
Troubleshooting approaches -
Browser or Telnet access problems -
Unusual network activity -
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General problems -
802.1Q Prioritization problems -
Addressing ACL problems -
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ACLs are properly configured and assigned to VLANs, but the switch is not using the ACLs to filter IP layer 3 packets -
The switch does not allow management access from a device on the same VLAN -
Error (Invalid input) when entering an IP address -
Apparent failure to log all "deny" matches -
The switch does not allow any routed access from a specific host, group of hosts, or subnet -
The switch is not performing routing functions on a VLAN -
Routing through a gateway on the switch fails
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The switch does not receive a response to RADIUS authentication requests -
The switch does not authenticate a client even though the RADIUS server is properly configured and providing a response to the authentication request -
During RADIUS-authenticated client sessions, access to a VLAN on the port used for the client sessions is lost -
The switch appears to be properly configured as a supplicant, but cannot gain access to the intended authenticator port on the switch to which it is connected -
The supplicant statistics listing shows multiple ports with the same authenticator MAC address -
The show port-access authenticator <port-list> command shows one or more ports remain open after they have been configured with control unauthorized -
RADIUS server fails to respond to a request for service, even though the server's IP address is correctly configured in the switch -
The authorized MAC address on a port that is configured for both 802.1X and port security either changes or is re-acquired after execution of aaa port-access authenticator <port-list> initialize -
A trunked port configured for 802.1X is blocked
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MSTP and fast-uplink problems -
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Switch access refused to a client -
Executing IP SSH does not enable SSH on the switch -
Switch does not detect a client's public key that does appear in the switch's public key file (show ip client-public-key) -
An attempt to copy a client public-key file into the switch has failed and the switch lists one of the following messages -
Client ceases to respond ("hangs") during connection phase
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Event Log -
All users are locked out of access to the switch -
No communication between the switch and the TACACS+ server application -
Access is denied even though the username/password pair is correct -
Unknown users allowed to login to the switch -
System allows fewer login attempts than specified in the switch configuration
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TimeP, SNTP, or Gateway problems -
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Fan failure -
Mitigating flapping transceivers
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Viewing transceiver information -
Using the Event Log for troubleshooting switch problems -
Debug/syslog operation -
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Debug/syslog messaging -
Hostname in syslog messages -
Debug/syslog destination devices -
Debug/syslog configuration commands -
Configuring debug/syslog operation -
Debug command -
Logging command -
Adding a description for a Syslog server -
Adding a priority description -
Configuring the severity level for Event Log messages sent to a syslog server -
Operating notes for debug and Syslog
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Diagnostic tools -
Viewing switch configuration and operation -
Restoring the factory-default configuration -
Restoring a flash image -
DNS resolver -
Locating a switch (Locator LED)
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MAC Address Management -
Remote Device Deployment (TR-069) -
Network Out-of-Band Management (OOBM) -
Support and other resources -
Documentation feedback