Cisco Router show commands
Posted by on 2014-09-19 14:37:11:
SHOW COMMANDS - CISCO ROUTERS (some command relevant to Cisco switches too)
Show version - software version, config files, boot images, config register, basic config of router
Show ipx interface - status, ipx rip and sap received/sent, ipx access-lists Show ipx route - ipx routing table Show ipx servers - server list (name, port, hops, type of service) Show ipx traffic - number/type of packets, RIP and SAP packets Show protocol - ipx addresses of an interface, IP addresses and routing protocol Show ip protocol - routing update times, networks active on, neighbour routers, administrative distances, AS number Show access-lists - shows standard and extended access-lists on all interfaces Show access-list 101 Show ip interface - IP addresses, masks, MTU, access-lists, split horizon, ICMP, CDP status, NAT statistics, LMI info, DLCIs Show interface serial 0 - shows bandwidth, MTU, keepalives Show ip route - ip routing table Show cdp neighbor - deviceID, local intf, holdtime, capability, platform, remote portID Show cdp entry * - IP address of neighbour, protocol info, platform, capability, portID, holdtime, same info as show version, neighbour device ID, local interface Show cdp neighbor detail - same as above also IP address, version info Show cdp traffic - info on traffic and errors Show cdp interface - encapsulation, timer, holdtime for each intf Show controllers serial 0 - shows DTE/DCE connections, buffer size, collisions, mac address Show host(s) - shows hostname to IP resolution of hosts Show session(s) - shows connections to a remote device Show users - shows connections to your router, port and time connected Show frame-relay lmi - lmi errors and lmi type Show frame-relay pvc - all configured PVC's, DLCI numbers, status of connections, No. of BECN/FECN Show frame-relay pvc 16 Show frame-relay map - ip to dlci mappings Show run - display router config (RAM), configured PVCs, ACLs.
SHOW COMMANDS - 1900 SWITCH
Show mac-address-table Show run Show ip - like ipconfig Show port system - shows switching method Show vtp Show trunk A allowed-vlans - shows which VLANS allowed on trunk link Show vlan-membership Show vlan 2 Show vlan - verify VLAN config Show history - shows last 10 commands entered by default Show terminal - shows terminal config + history buffer size
GENERAL ROUTER COMMANDS
Banner exec - for activation or incoming vty Banner incoming - displayed on reverse telnet sessions Banner login - displayed on all connected terminals. Displayed before MOTD banner but before login prompts Bfe - manual emergency mode setting Clear counters - clears counters on all interfaces Clear frame-relay-inarp - clears dynamic mappings Clear line 1 - clears vty 1 connection to a remote router Clock set 10.30.10 28 may 2002 Config-register 0x2102 - changes config register Copy flash tftp Copy tftp flash - copies IOS image from tftp server default directory to router flash Disable - to get back to user mode from privileged Disconnect 1 - clears a connection to a remote router Enable - to get into privileged mode Enable last-resort - define enable action if no tacas servers respond Enable use-tacas - tells the router to authenticate passwords through a tacas server Encapsulation isl 3 - encapsulates ISL frame-tagging for VLAN 3 on an interface Exec timeout 0 1 - sets console timeout to 1 second Exec-timeout 0 0 - sets exec timeout to never timeout Exec-timeout 1 0 - set exec timeout to 1 minute Ip domain-lookup - enables DNS (use no form to stop this) Ip domain-name nikmakris.com - appends domain name to hostname (required for DNS) Ip host nik 172.17.1.63 - adds to host table (up to 8 ip addr) Ip name-server - sets ip address(es) of DNS servers Lock - locks the terminal Logging synchronous - stops console messages overwriting commands Logout - to logout of the router Media-type 100BaseX - sets media type Mrinfo - request neigbour and version information from a multicast router No login - sets line, vty ports not to prompt for login info Passive-inteface s0 - disables routing updates on interface (Global command) - they are not sent out this interface but they are still received. Ping ipx 40.0000.0c8d.5c9d Service password-encryption - encrypts passwords (Global command) Terminal monitor - needed to view debug commands from telnet session Terminal history size 50 - sets command history to 50 lines Tftp-server system - Make router a tftp server
CONFIGURE COMMANDS
Interface Ethernet 2/0/1 - type slot / port adapter / port number (interface) for VIP cards Config terminal - configures RAM Config network (config net) - changes a config on a tftp host Config memory - configure NVRAM Ip address 172.17.1.63 255.255.255.0 secondary - adds a secondary subnet address to an interface Clock rate 56000 - sets clock rate to 56kbps for DCE interfaces
ACCESS LISTS (ACL)
Access-enable - creates a temporary access-list entry Access-template - creates a temporary access-list entry Access-profile - apply user profile to interface Access-list 1 permit 0.0.0.0 255.255.255.255 - same as next line Access-list 1 permit any - permits any host Access-list 1 permit 172.30.16.29 0.0.0.0 - same as next line Access-list 1 permit host 172.30.16.29 - permits host 172.30.16.29 No access list 1 - deletes access list 1 Ip access-group 1 out (out is default) Access-list 101 deny tcp 172.16.4.0 0.0.0.255 any eq telnet Access-list 101 permit ip any any established (TCP connection) Router(Config)#ip access-list standard nik Router(Config std-nacl)#deny any log (log - logs packets) No ip access-group in - won't delete inbound lists if you leave the in off the end of the command
FRAME RELAY
Router(Config)#int s0 Router(Config-if)#encapsulation frame-relay cisco (default) Router(Config-if)#exit Router(Config)#int s0.16 point-to-point Router(Config-if)#no inverse-arp Router(Config-if)#ip address 172.17.1.63 255.255.255.0 Router(Config-if)#bandwidth 64 - sets bandwidth to 64kbps (Only used by routing protocols) Router(Config-if)#frame-relay map ip 172.16.30.17 16 ietf broadcast - broadcast tells the router to send broadcasts out this intf
IGRP CONFIGURATION
Router(Config)#router igrp 50 Router(Config-router)#timers basic 15 45 0 60 Router(Config-router)#variance 1-128 (controls load balancing between best and worse metrics) Router(Config-router)#traffic-share balanced/min Balanced - share inversely proportional to metrics Min - use routers that have only min costs Router(Config-router)#network 128.6.0.0 Router(Config-router)#no metric holddown Router(Config-router)#metric maximum-hop 50
IPX RIP CONFIGURATION
Router(Config)#ipx routing - enables IPX routing, RIP and SAP Router(Config)#ipx maximum-paths 2 - enables equal cost load balancing over 2 paths Router(Config)#ipx per-host-load-share - ensures all packets to 1 destination are sent over same line Router(Config)#int e0 Router(Config-if)#ipx network 10 encapsulation sap secondary - assigns ipx network 10 to a secondary interface on Ethernet 0 with encapsulation Ethernet_802.2 Router(Config-if)#ipx delay 6 - sets tick metric for IPX RIP (LAN = 1, WAN = 6 default) Router(Config-if)#exit
CISCO ISDN CONFIGURATION
Router(Config)#interface bri 0 Router(Config-if)#ip address 172.17.1.63 255.255.255.0 Router(Config-if)#no shutdown Router(Config-if)#dialer-group 1 Router(Config-if)#dialer map ip 172.16.60.2 name 8042 8350661 (Next router ip - hostname of next route (auth) - number to dial) Router(Config-if)#dialer load-threshold 2 either - makes both interfaces come up immediately Router(Config-if)#dialer load-threshold 255 either - only brings up 2nd B-channel if first is 100% loaded Router(Config-if)#hold-queue 75 in - holds 75 packets in the queue during connection Router(Config-if)#dialer idle-timeout 300 - sets idle time out (120 default) Router(Config-if)#encapsulation ppp Router(Config-if)#exit Router(Config)#dialer-list 1 list 110 Router(Config)#access-list 110 permit tcp any any eq smtp Router(Config)#access-list 110 permit tcp any any eq telnet
STATIC/DEFAULT ROUTES
Ip route 0.0.0.0 0.0.0.0 172.16.20.1 = default route Ip default-network 172.16.1.0 Ip route 172.17.1.63 255.255.255.0 serial 1 1 permanent - keeps static route even if router cannot communicate with it, administration distance 1
CISCO DISCOVERY PROTOCOL (CDP) COMMANDS
Cdp timer 90 Cdp holdtime 240 Cdp enable (no cdp enable)
1900 SWITCH CONFIGURATION
#config t (Config)#enable password level 1 nikolas - usermode password (Config)#enable password level 15 makris - enable password (Config)#enable secret nik2 - precedes the enable p/w (Config)#hostname nik (Config)#vtp pruning enable - enables pruning on whole switch (Config)#delete vtp - deletes VTP database (Config)#vtp server (client/transparent) (Config)#vtp domain nikolas (Config)#vtp password cisco (Config)#ip address 172.17.1.63 255.255.255.0 (Config)#ip default-gateway 172.17.1.50 (Config)#switching-mode store-and-forward (fragment-free) (Config)#vlan 2 name sales (Config)#vlan 3 name marketing (Config)#int Ethernet 0/1 - slot 0/port 1 (Config-if)#vlan-membership static 2 (Config-if)#description Finance_VLAN (Config-if)#port secure max-mac-count 1 - allows only one mac address per port (Config-if)#exit (Config)#int f0/26 (Config-if)#trunk on - enables trunking of all VLANS not just VLAN 1 (Config-if)#no trunk-vlan 3 - stops trunking vlan 3 (Config-if)#duplex full - sets to full duplex (auto sense default) (Config-if)#exit (Config)#copy tftp://192.168.0.120/cat1900EN_9_00.bin opcode - download into flash memory (Config)#copy nvram tftp://192.168.0.120/cat1900EN (Config)#copy tftp://192.168.0.120/cat1900EN nvram (Config)#delete nvram - deletes config (Config)#delete vtp - deletes VTP database (Config)#clear mac-address-table [dynamic]
CISCO DEBUG COMMANDS
Debug ipx routing activity - info on RIP updates Debug ipx sap - info on sap updates Debug ip igrp events - what's being rec'd sent, route type (int/ext,system), source, dest Debug ip igrp transactions - shows contents of routing updates Debug ip rip - source/contents of updates, network, metrics Debug frame-relay lmi - enables verification of connection Debug ppp authentication
UNDEBUG ALL
Turn of debugging.
Tags: Networking , Cisco
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