router
How to get General Router Information
The user mode command show version gives us information about the general configuration of the router. Tthe output generated by the show version command on our test 2520 router testrouter. testrouter>show version Cisco Internetwork Operating System Software IOS ™ 2500 Software (C2500-JS-L), Version 11.3(5), RELEASE SOFTWARE (fc1) Copyright (c) 1986-1998 by cisco Systems, Inc. Compiled [...]
How to “Network Ping Lite†for iPhone
Another nice free admin tool “Network Ping Lite†with useful features: Ping a single IP address Ping a subnet to get an overview Traceroute to determine the route taken by packets Telnet console for simple access to a router or Unix server Get it from here: Download link iTunes Store.
How to Enable/Disable IP Forwarding in Solaris 10 without reboot
In Solaris 10, IP Forwarding can be enabled or disabled using the routeadm & ifconfig commands as against the ndd commands in Solaris 9 and earlier. The advantage is the change dynamic and real-time and the change persist across reboot unlike the ndd command. Enable/Disable IP Forwarding globally To globally enable IP Forwarding in Solaris [...]
How to Copy the existing Cisco IOS Software to a TFTP server.
Enter the copy command to perform these tasks: •Download a system image or configuration file from a TFTP or rcp server to a Flash device •Upload a system image or configuration file from a Flash device to a TFTP or rcp server •Configure the switch using a configuration file on a Flash device or on a [...]
How to Enable IP Fast Switching on a Cisco Router
Fast switching involves the use of a high-speed switching cache for IP routing. Destination IP addresses are stored in the high-speed cache to expedite packet forwarding. In some cases, fast switching is inappropriate, such as when slow-speed serial links (64K and below) are being fed from higher-speed media such as T1 or Ethernet. In such [...]
How to re-enable fast switching on a Cisco Router
Fast switching allows higher throughput by switching a packet using a cache created by the initial packet sent to a particular destination. Destination addresses are stored in the high-speed cache to expedite forwarding. Routers offer better packet-transfer performance when fast switching is enabled. Fast switching is enabled by default on all interfaces that support fast [...]
How to enable process switching on a cisco Router
Per-destination or per-packet load-balancing depends on the type of switching scheme used for IP packets. By default, on most Cisco routers, fast switching is enabled under interfaces. This is a demand caching scheme that does per-destination load-balancing. To set per-packet load-balancing, enable process switching (or disable fast switching), use these commands: Router# config t Router(config)# [...]
How to Verify Default Passive Interfaces in Cisco Router
To verify that interfaces on your network have been set to passive, you could enter a network monitoring command such as show ip ospf interface, or you could verify the interfaces you enabled as active using a command such as show ip interface. The following is an example of verifying passive interfaces in an OSPF network: •Enter [...]
How to Configure and verify IP over a CLNS Tunnel -Cisco IOS
To configure IP over a CLNS Tunnel (CTunnel), use the following commands beginning in global configuration mode: Command Purpose Step 1 Router(config)# interface ctunnel interface-number Creates a virtual interface to transport IP over a CLNS tunnel and enters interface configuration mode. The interface number must be unique for each CTunnel interface. Step 2 Router(config-if)# ctunnel destination remote-nsap-address Configures the [...]
How to Configure BGP Soft Reset Using Stored Routing Policy Information
If all of the BGP routers in the connection do not support the route refresh capability, use the soft reset method that generates a new set of inbound routing table updates from information previously stored. To initiate storage of inbound routing table updates, you must first preconfigure the router using the neighbor soft-reconfiguration router configuration command. [...]
How to Reset a Router Using BGP Outbound Soft Reset
Outbound soft resets do not require any preconfiguration. Using the soft keyword specifies that a soft reset be performed. To perform an outbound soft reset, use the following command in EXEC mode: Command Purpose Router# clear ip bgp {* |neighbor-address | peer-group-name}soft out Performs a soft reset on the connection specified in the command. The neighbor-address argument specifies the [...]
How to Enable BGP Routing in Cisco IOS
To enable BGP routing and establish a BGP routing process, use the following commands beginning in global configuration mode: Command Purpose Step 1 Router(config)# router bgp as-number Enables a BGP routing process, which places the router in router configuration mode. Step 2 Router(config-router)# network network-number [mask network-mask] [route-maproute-map-name] Flags a network as local to this autonomous system [...]
How BGP Selects Paths – Cisco IOS
A router running Cisco IOS Release 12.0 or later does not select or use an iBGP route unless both of the following conditions are true: •The router has a route available to the next hop router: •The router has received synchronization via an IGP (unless IGP synchronization has been disabled). BGP bases its decision process [...]
How to configure MD5 authentication for BGP
Border Gateway Protocol (BGP) supports authentication mechanism using the Message Digest 5 (MD5) algorithm. When authentication is enabled, any Transmission Control Protocol (TCP) segment belonging to BGP exchanged between the peers is verified and accepted only if authentication is successful. For authentication to be successful, both the peers must be configured with the same password. If authentication [...]