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#