RSSAll Entries Tagged With: "Ethernet"

Find Amount of Packets Processed By the Cisco Gig-E Interface

Now we are going to find or see the amount of packets and type of packets processed by the Gigabit Ethernet Interface on Cisco Router. This command is useful for troubleshooting Gigabit Ethernet interfaces on Cisco Router. Show Counters Interface Command Simply use the show counters interface command. Login using telnet and type the command: Cisco-Router#sh counters interface GigabitEthernet 5/1 Find Amount of Packets Processed by Cisco Gigabit Ethernet Interface Cisco-Router#sh counters interface  Gi5/1 64 bit counters: 0.        rxHCTotalPkts = 75631693020 1.                      txHCTotalPkts = 77690922915 2.                    rxHCUnicastPkts = 75595615119 3.                    txHCUnicastPkts = 77679618692 4.                  rxHCMulticastPkts = 34605567 5.                  txHCMulticastPkts = 11284923 6.                  rxHCBroadcastPkts = 1472334 7.                  txHCBroadcastPkts = 19300 8.                         rxHCOctets = 33925612619909 9.                         txHCOctets = 21535942410776 10.                 rxTxHCPkts64Octets = 56920959228 11.            rxTxHCPkts65to127Octets = 53382181374 12.           rxTxHCPkts128to255Octets = 6069758790 13.           rxTxHCPkts256to511Octets = 4429991882 14.          rxTxHCpkts512to1023Octets = 2943499164 15.         rxTxHCpkts1024to1518Octets = 29576225497 16.                    txHCTrunkFrames = 0 17.                    rxHCTrunkFrames = 0 18.                     […]

Difference Between Collision Domain and Broadcast Domain

This tutorial is going to be focusing on two major things collision domains and broadcast domains. You should aware of two different types of domains when designing a LAN otherwise both of these domains can harm the performance of your network. If you are not aware of the difference between these two domains, this tutorial should help you out. Collision Domain A collision domain is a section of a network where data packets can collide with one another when being sent on a shared medium or through repeaters, in particular when using early versions of Ethernet the set of LAN devices whose frames could collide with one another. In Collision domain with hubs, bridges, repeaters and wireless access points as only one device can send and receive at a time. If more than one device tries sending or receiving, the information is lost and irrecoverable it will need to be resent. […]

Configure an HWIC-4ESW / HWIC-D-9ESW Switch module on Cisco Router

In this post I covered the configuration procedure for the 4-port Cisco HWIC-4ESW and the 9-port Cisco HWIC-D-9ESW EtherSwitch high speed WAN interface cards (HWICs) and this module feature supported on Cisco 1800 (modular), Cisco 2800, and Cisco 3800 series integrated services Routers (ISR). The Cisco HWIC-4ESW / HWIC-D-9ESW are having 10/100BaseT Layer 2 Ethernet switching with Layer 3 Routing capability. Please follow the configuration steps bellow: Limitations of EtherSwitch HWICs: The following restrictions apply to the Cisco HWIC-4ESW and the Cisco HWIC-D-9ESW EtherSwitch HWICs. • No more than two Ethernet Switch HWICs or network modules may be installed in a host Router. • Multiple Ethernet Switch HWICs or network modules installed in a host Router will not act independently of each other. They must be stacked, otherwise they don’t work at all. • The ports of a Cisco EtherSwitch HWIC must NOT be connected to the Fast Ethernet/Gigabit onboard ports […]

How to Troubleshoot Cisco Fastethernet or Gigabitethernet Interface

Basic Fastethernet and Gigabitethernet Interface Troubleshooting Steps: Follow  below steps to troubleshoot the Ethernet, Fastethernet, GigabitEthernet or Tengigabitethernet on Cisco Router or Switch. Enter the show interfaces fastethernet, show interfaces gigabitethernet or show interfaces tengigabitethernet command. 1)       Verify that the interface is up. 2)       Verify that the line protocol is up. 3)       Verify that the interface duplex mode matches the remote interface configuration. 4)       Verify that the interface speed matches the speed on the remote interface 5)       Observe the output hang status on the interface. 6)       Observe the CRC counter. 7)       Observe the late collision counter. 8)       Observe the carrier signal counters. Troubleshoot and correct the detected problems on Fastethernet/Gigabitethernet Interface:   1) Verify that the interface is up: In the output got from the show interfaces fastethernet, show interfaces gigabitethernet or showinterfaces tengigabitethernet command, verify that the interface is up. If the interface is down, perform the following corrective actions: If […]

RJ45 Straight-through and Cross-over Cabling standards

The information listed here is to assist Network Administrators in the color coding of Ethernet cables. RJ-45 conductor data cable contains 4 pairs of wires each consists of a solid colored wire and a strip of the same color. There are two wiring standards for RJ-45 wiring: T-568A and T-568B. Although there are 4 pairs of wires, 10BaseT/100BaseT Ethernet uses only 2 pairs: Orange and Green. The other two colors (blue and brown) may be used for a second Ethernet line or for phone connections. The two wiring standards are used to create a cross-over cable (T-568A on one end, and T-568B on the other end), or a straight-through cable (T-568B or T-568A on both ends). Please be aware that modifying Ethernet cables improperly may cause loss of network connectivity. Straight-Trough Cable: To create a straight-through cable, you have to wire T-568A or T-568B on both ends of the cable. […]