Cisco IOS

Wichtigste Befehle

show running-configuration

show interfaces description

find a Switchport with an IP Address

example:

• login to coreswitch
• get the Mac addr

show arp | include 172.23.133.11
Internet  172.23.133.11          56   00d0.c971.2821  ARPA   Vlan633

• show the port on witch the mac is located

sh mac address-table | include 00d0.c971.2821
633    00d0.c971.2821    DYNAMIC     Te1/0/6

• have a look on witch accessswitch Te1/0/6 is

sh cdp neighbors

Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
                  S - Switch, H - Host, I - IGMP, r - Repeater,P - Phone,
                  D - Remote, C - CVTA, M - Two-port Mac Relay 

Device ID        Local Intrfce     Holdtme    Capability  Platform  Port ID
Brun06wt3og4500.itsroot.net
                 Ten 1/0/24        173              R S   WS-C4500X Ten 1/7
weis26b242ogost2960-10.itsroot.net
                 Ten 1/0/9         134              S I   WS-C2960X Gig 1/0/25
weis26b242ogost2960-10.itsroot.net
                 Ten 2/0/9         134              S I   WS-C2960X Gig 6/0/25
weis26b241ogost2960-10.itsroot.net
                 Ten 1/0/6         173              S I   WS-C2960X Gig 1/0/25
weis26b241ogost2960-10.itsroot.net
                 Ten 2/0/6         173              S I   WS-C2960X Gig 3/0/25
weis26b044og2960labor-10.itsroot.net
                 Ten 1/0/17        138              S I   WS-C2960X Gig 1/0/25
weis26b24ugost2960-10.itsroot.net
                 Ten 1/0/13        144              S I   WS-C2960X Gig 1/0/25
weis26b06ug2960c-11.itsroot.net
                 Ten 1/0/11        163              S I   WS-C2960C Gig 0/1
...

(just for info) if you want to know more about the neighbor

cdp weis26b241ogost2960-10.itsroot.net

• So, you know now the accessswitch. Now login in to the accessswitch you found on the neighbour table (weis26b241ogost2960-10) and serch it in the mac adress-table

weis26b241ogost2960-10#sh mac address-table | include 00d0.c971.2821
 633    00d0.c971.2821    DYNAMIC     Gi3/0/14
weis26b241ogost2960-10#

Eh voila, the port is Gi3/0/14 on weis26b241ogost2960-10