Management and Configuration Guide K/KA/KB.15.15

ACL, 371
Disallowed routed access, 372
Implicit deny any function, 372
IP Layer 3 packet filter, 371
Authentication
Control authorized, 375
Duplicate MAC address, 375
Port security, 376
Broadcast storms, 377
Broken SSH connection, 297
Cable testing, 455
Clear/reset factory default, 441
Configuring DNS entries, 446
Configuring Syslog servers and debug destinations, 400
Console access problems, 369
Customizing show tech output, 435
DHCP
Duplicate IP address, 370
Diagnostics tools, 426
DNS operating notes, 449
DNS resolution configuration, 446
DNS resolver, 444
DNS resolver operation, 445
Duplicate address, 370
Event log entries
Event log entry format, 382
Event log use, 382
Fan failure, 381
Fast uplink, 378
Gateway, 380
Gateway traffic
Routing, 373
Halting Ping test, 429
ICMP echo
Ping test, 427
IGMP, 374
IP mutlicast traffic floods, 374
IGMP traffic
Unable to reach hosts, 374
IP address
Host option, 372
Jumbo frames, 195
Jumbo frames ports drop inbound traffic, 195
LACP, 374
failure to enable LACP, 374
Link test, 426
WebAgent, 426
Locator LED, 449
Marginal transceiver
Flapping transceivers, 457
Mesh, 374
MSTP
Fast uplink problems, 377
Multiple Link test, 429
Network slow
Failed access, 370
Ping and link tests, 426
Ping test, 426
WebAgent, 426
Port auto-negotiation
Loss of link between devices, 426
Port-based access control
Event log messages, 374
Public key
Copy failed, 378
Failure to detect, 378
QoS problems, 376
RADIUS
Failed response, 376
RADIUS authentication
Access to a VLAN lost, 375
Failed response, 376
Failure to authenticate, 375
Failure to receive, 374
RADIUS problems, 376
RADIUS server
Failure to respond, 377
Recovering empty flash, 443
Restoring flash image, 443
Saving show tech output, 434
Searching for text patterns, 437
SSH
Access refused, 378
Client hangs, 379
Enable failed, 378
SSH problems, 378
SSH, SFTP, and SCP Operations, 296
TACACS, 379
Access denied, 380
Communication failure, 379
Event log, 379
Login attempts, 380
Unknown users, 380
TACAS
Access failure, 379
Telnet access problems, 369
TIMEP
SNTP, 380
Traceroute, 430
Stopping, 431
Traceroute fails, 431, 432
Transceiver diagnostics, 450
Trunked port
Blocked, 376
Unresponsive DHCP/BootP operation, 370
Unusual network activity, 370
Viewing information for diagnosis, 440
Viewing running config, 432
WebAgent, 433
Viewing summary data, 433
Viewing switch operation, 432
Viewing switch operation information, 437
Viewing transceivers with VCT support, 457
VLAN, 380
Device failures, 380
Duplicate MAC addresses, 381
Failed connection with gateway, 380
Mesh traffic stalled, 374
526 Index