Fedora Linux: CISCO

Showing posts with label CISCO. Show all posts

IOS Conflicting DHCP Address

http://blog.ipspace.net/2007/08/dhcp-conflict-logging-true-story.html

Basic

# write = copy running-config startup-config
# write erase

Ctrl-R = refresh line Ctrl-Z = end Ctrl-A = beginning of a line Ctrl-E = end of the line Ctrl-D = Delete previous char Ctrl-W = delete previous word

IP Address, subnetting

Class A: starts with 0x0xxxxxxx (0-127), 127=128-1 Class B: starts with 0x10xxxxxx (128-191), 191 = 128+64-1 Class C: starts with 0x110xxxxx(192-223), 223 = 128+64+32-1 Class D: starts with 0x1110xxxx(224-239), 239= 128+64+32+16-1 Class E: starts with 0x11110xxx(240-255) not used.

List DHCP lease and clients

show dhcp server
show dhcp lease
show ip dhcp binding

NAT

config t
interface gigabitethernet 0/1
ip nat inside
end

# forward ssh
ip nat inside source static tcp 192.168.10.1 22 interface BVI3 22
# turn it off
no ip nat inside source static tcp 192.168.10.1 22 interface BVI3 22

SVI - Switch Virtual Interface

There is no physical interface for the VLAN and the SVI provides the Layer 3 processing for packets from all switch ports associated with the VLAN. - There is one-to-one mapping between a VLAN and SVI

# int vlan 1
# ip address 192.168.0.254 255.255.255.0
# int vlan 2
# ip address 192.168.1.254 255.255.255.0

# ip default gateway 192.168.1.254

IP Routing

# ip routing 
# no ip routing

Static Routing

# ip route 0.0.0.0 0.0.0.0 192.168.1.5
# ip route 192.168.0.0 255.255.255.0 192.168.2.5
# show ip route 192.168.0.1

RIPv2

# conf t
# router rip
# version 2
# no auto-summary
# network 192.168.1.0
# network 192.168.3.0

Router on a Stick, sub-interfaces

On the switch, configure the link to router as trunk

# switchport trunk encapsulation dot1q
# switch mode trunk
# show interfaces trunk

On the router interface, remove IP on the main interface

# int fa0/0
# no ip address
# int fa0/0.2
# encapsulation dot1Q 2
# ip address 192.168.1.1 255.255.255.0
# int fa0/0.4
# encapsulation dot1Q 4
# ip address 192.168.3.1 255.255.255.0
# show ip route

CISCO Switch Commands

Show Commands

show version
show boot 
show running-config
show ip interface
show file system
show ip int brief | excl unassigned
dir
cd

Configure IP

enable
configure t
interface vlan1
ip address 192.168.11.200 255.255.255.0
no shutdown

Upgrade

Method 1, copy tar file and extract tar file

copy tftp://192.168.11.1/c2960c405-universalk9-tar.150-2.SE.tar c2960c405-universalk9-tar.150-2.SE.tar
verify /md5 flash:/c2960c405-universalk9-tar.150-2.SE.tar
config terminal
boot system flash:/c2960c405-universalk9-mz.150-2.SE/c2960c405-universalk9-mz.150-2.SE.bin

Method 2, use archive commands which works with tar archive

archive download-sw  /leave-old-sw /reload  tftp://192.168.11.1/c2960c405-universalk9-tar.150-2.SE.tar

Method 3, bin file upgrade

copy tftp://192.168.11.1/c3560c405ex-universalk9-mz.150-2.SE.bin c3560c405ex-universalk9-mz.150-2.SE.bin
config terminal
boot system flash:c3560c405ex-universalk9-mz.150-2.SE.bin

Other commands

?
copy ?
delete /force /recursive c2960c405-universalk9-mz.150-2.SE

copy system:running-config tftp://192.168.11.1/running-config

copy nvram:startup-config tftp://192.168.11.1/startup-config

copy running-config startup-config

show ip int brief | excl unassigned

vlan

config t
interface vlan303
 ip address dhcp
end

##wan
interface GigabitEthernet0/10
switchport access vlan 303
 switchport mode access
 no cdp enable
 spanning-tree portfast
 spanning-tree bpdufilter enable

##lan
interface GigabitEthernet 0/5
switchport access vlan 303
 switchport mode access

Fedora Linux