Tag: Duplex
show cdp neighbors detail
show cdp neighbors detail
RouterEdge#show cdp neighbors detail
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Device ID: CoreSwitch
Entry address(es):
Platform: cisco WS-C3750-24P, Capabilities: Router Switch IGMP
Interface: GigabitEthernet0/0, Port ID (outgoing port): FastEthernet1/0/1
Holdtime : 164 sec
Version :
Cisco IOS Software, C3750 Software (C3750-IPSERVICESK9-M), Version 12.2(55)SE5, RELEASE SOFTWARE (fc1)
Technical Support: https://www.cisco.com/techsupport
Copyright (c) 1986-2012 by Cisco Systems, Inc.
Compiled Thu 09-Feb-12 18:59 by prod_rel_team
advertisement version: 2
Protocol Hello: OUI=0x00000C, Protocol ID=0x0112; payload len=27, value=00000000FFFFFFFF010221FF000000000000001C58E26700FF0000
VTP Management Domain: ”
Native VLAN: 1
Duplex: full
show interfaces status
show interfaces status
Show interfaces status on a Catalyst IOS switch, all the interfaces.
SwitchAccess1#show interfaces status
Port Name Status Vlan Duplex Speed Type
Fa0/1 connected 10 a-full a-100 10/100BaseTX
Fa0/2 notconnect 20 auto auto 10/100BaseTX
Fa0/3 notconnect 30 auto auto 10/100BaseTX
Fa0/4 notconnect 1 auto auto 10/100BaseTX
Fa0/5 notconnect 1 auto auto 10/100BaseTX
Fa0/6 notconnect 1 auto auto 10/100BaseTX
Fa0/7 notconnect 1 auto auto 10/100BaseTX
Fa0/8 notconnect 1 auto auto 10/100BaseTX
Fa0/9 notconnect 1 auto auto 10/100BaseTX
Fa0/10 notconnect 1 auto auto 10/100BaseTX
The duplex mismatch the two devices, the connection it will be too slow, but the mismatch speed will cause no connection between them.
Switch System Indicator LED Status
Switch System Indicator LED Status
SYS’LED in Amber means the POST failed, IOS did not load and the switch is not functioning.
Switch Mode LEDs
STAT in Green/ambar: Excessive collision or errors are creating a link fault.
STAT in Amber: The port is blocked by Spanning Tree Protocol(STP). Blink ambar indicates activity on the
blockeg port.
Duplex: Off, is half duplex
Duplex: Green is full duplex
SPEED: Off is 10 Mbps
Green is at 100 Mbps
Blinking green 1000 Mbps
Cisco switches can match the highest speed that both ends support, but if the speed can’t be determined at all, it defaults to the lowest interface speed (10 Mbps) at half duplex.
Cisco switch led indicators
Cisco switch led indicators
A) SYSTEM(SYST)
Overall status of the switch.
Off: Switch is not powered on
Green: Switch is working fine
Amber: Switch is powered on but faulty
B)REDUNDANT POWER SUPPLY(RPS)
Provides backup power to the switch if the main supply goes off.
Off: No RPS available,
Green: RPS is working fine
Blinking Green: Providing backup to some other device
Amber: RPS is faulty
Flashing Amber: RPS is providing backup(primary power off)
D) DUPLEX
Duplex status of the switch ports.
Off: Switch port is half duplex
Green: Switch port is full duplex
D)STAT
Status of the switch ports.
Off: No device connected/port is administratively down.
Green: Device is connected.
Blinking green: Port is sending/receiving data.
Alternating green amber: Fault in link/Frames experiencing error
Amber: Port is blocked by Spanning Tree Protocol
E)SPEED
Speed status of the switch ports.
Off: Switch port is operating at 10Mbps
Solid green: Switch port is operating at 100 megabits per second.
Flashing green: Switch port is operating at 1 gigabit per second.
Flashing green means 1 gigabit per second. Solid green means 100 megabits per second. And off means 10. Well we could also verify that in the operating system – show interface status. Show, right, show interface status will tell us what our speed is. We’ll also be able to look at show interface output as well.
F)PoE(Power Over Ethernet)
Some switches have a PoE LED in the system status group of LEDs. This LED indicates the per-port and system PoE status.
Connecting to the console
- Serial port – RJ45
- USB-to-Serial port adapter
- Using a terminal program, example a Putty(PuTTY is an SSH and telnet client)
Option controlling local serial lines, configuring the serial line choosing
the Speed(Baud): 9600
Data bits: 8
Stop bits: 1
Parity: none/Yes
and Flow control
We can use only console port at given time, for example if you a connect to USB console port the traditional console(RJ45 or Serial) will be disable automatically and vice-versa