Clear Command on CISCO Router/Switch

Command

Clear

Use

This command is used to clear various counters in IOS as well as to reset various routing protocol adjacencies.

Syntax

Router#clear <option>

Optional Switches

aaa Clear AAA values
access-list Clear access list statistical information
access-template Access-template
adjacency Adjacent nodes
alps Clear Alps
appletalk Reset AppleTalk information
arp-cache Clear the entire ARP cache
backhaul-session-manage Backhaul Session Manager information
bgp Clear BGP connections
bridge Reset bridge forwarding cache
bsc Clear counters in command
bstun Clear counters displayed in show bstun
call Call
cdp Reset cdp information
cef CEF information related to linecard
clns CLNS
cns CNS agents
counters Clear counters on one or all interfaces
crypto Encryption subsystem
decnet Reset DECnet information
dialer Clear dialer statistics
dlsw Data Link Switching (DLSw)
dot1x Clear Dot1x information
drip Clear drip
dspfarm clear DSPFARM
frame-relay Clear Frame Relay information
funi FUNI information
h323 Clear H.323 protocol related information
host Delete host table entries
interface Clear the hardware logic on an interface
ip IP
ipv6 IPv6
ipx Reset Novell/IPX information
isis Clear IS-IS data structures
kerberos Clear Kerberos Values
lane lane
line Reset a terminal line
logging Clear logging buffer
mac-address-table MAC forwarding table
memory Memory counters
mgcp clear Media Gateway Control Protocol
mpls Reset MPLS statistical information
mpoa MPOA clear commands
mrcp Clear MRCP statistics
ncia Native Client Interface Architecture (NCIA)
netbios-cache Clear the entire NetBIOS name cache
oer Optimized Exit Routing information
pagp Port channel information
parser Clear parser data
ppp Clear ppp statistics
pppatm PPP over ATM
pppoe PPP over Ethernet
radius Clears radius server information
rbscp RBSCP statistics/information
rif-cache Clear the entire RIF cache
route-map Clear Route Map statistical information
rpms-proc Clear RPMS Process Information
rudpv1 Clear Rudpv1 information
sccpold clear Skinny Client Control Protocol
scp Clear SCP commands
sip-ua Clear SIP User Agent Information
snapshot Clear Snapshot timers
source-bridge Clear counters displayed in “show source-bridge”
sss Subscriber Service Switch Information
statistics Statistics
stun Clear counters displayed in show stun
subscription Clear Subscriptions
tag-switching Reset tag switching information
tarp Reset tarp information
tcp Clear TGREP counters/session
vlan Clear vLAN statistical information
voice Clear Voice
vpdn Clear a VPDN entity
vsp Voice Streaming Processing information
vtp Clear VTP items
webvpn WebVPN information
x25 Clear X.25 circuits
xot Clear an XOT (X.25-Over-TCP) VC

Example

Since there is so many different clear options, we have added a clear section with some of the more useful clear commands for a CCNA candidate.

R2#clear ip ospf process
Reset ALL OSPF processes? [no]: y
R2#
*Mar 1 04:52:42.914: %OSPF-5-ADJCHG: Process 1, Nbr 3.3.3.3 on FastEthernet1/0 from FULL to DOWN, Neighbor Down: Interface down or detached
*Mar 1 04:52:43.110: %OSPF-5-ADJCHG: Process 1, Nbr 3.3.3.3 on FastEthernet1/0 from LOADING to FULL, Loading Done
R2#

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