Category Archives: Cisco

Cisco SNMP v3

Configure snmp v3:

snmp-server group GROUP v3 priv
snmr-server user USER GROUP v3 auth sha PUBPASSWORD priv aes 128 PRIVPASSWORD
snmp-server contact JohnDoe
snmp-server location Danlq

Change GROUP, USER, PUBPASSOWRD and PRIVPASSWORD according to your needs.

Get ID of the device:

sh snmp engineID

You get for examle:

Local SNMP engineID: 300000090C009C4E90AFB1M3
Remote Engine ID          IP-addr    Port

Cisco NAT range ports

This article describes how to open a range port from outside to an inside server.

fa0/0 is public interface
Public interface has IP address
fa0/1 is lan interface
LAN network is

Create an extended acl

R1(config)#ip access-list extended NAT_SERVER1
r0(config-ext-nacl)#permit tcp host range 40000 60000 any
r0(config-ext-nacl)#permit udp host range 40000 60000 any

Associate the acl to the route-map

R1(config)#route-map NAT_SERVER1_RULES per 10
R1(config)#match ip address NAT_SERVER1

Finaly nat with route-map

R1(config)#ip nat inside source static route-map NAT_SERVER1

Cisco switch Port-Channel (bonding)

Cisco port-channel consists of link agretation.

Switch(config)#conf t
Switch(config)#interface range gi1/0/25-26
Switch(config-if-range)#channel-group 2 mode active

Global view:

Switch#show etherchannel summary

Detailed view for port-channel 2 (po2):

Switch#show etherchannel 2 detail

Details of ports included in port-channel (po2):

Switch#show etherchannel 2 port

Suppress port-channel (po2):

Switch#no interface PortChannel2
Switch#no int Po2