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Spanning Tree Protocol Security

by ShahedJanuary 12, 2011October 30, 20150

Spanning Tree Protocol Security Today I will discuss about Spanning Tree Protocol Security issue. Spanning Tree Protocol (STP), also known as 802.1d, is a Layer 2 protocol designed to prevent loops within switched networks. Typically, STP goes through a number of states (e.g., block, listen, learn, and forward) before a port is able to pass user traffic. [boxads] A vulnerability associated with STP is that a system within the network can actively modify the STP topology. There is no authentication that would prevent such an action. The bridge ID, a combination of a two-byte priority and a six-byte MAC address, …

by ShahedJanuary 11, 2011October 30, 20150

Spanning Tree Protocol Overview Today I will discuss about Spanning Tree Protocol. STP prevents a network from frame looping by putting some interfaces in forwarding state & some interfaces in blocking state. [boxads] Whenever two or more switches are connected with each other for redundancy purpose loop can occur. STP Protocol is used to prevent the loop. Spanning Tree Protocol is layer 2 Protocol & by default it is enabled on switches. If we don’t use STP, these problems will occur on the network: (i) Broadcast Storms (ii) High Processor Utilization (iii) Mac Table instability (iv) Multiple Frame Transmission STP …

by ShahedJanuary 7, 2011October 26, 20150

Vlan mapping Huawei Switch: Today I will show you how to configure Vlan mapping Huawei Switch / Vlan converting from one Vlan to another vlan. Let’s go…………. [boxads] Step-1: At first login your switch & create your desired vlan in Vlan databae which you use. Step-2: Then go to interface mode & follow bellow example. interface GigabitEthernet0/0/1 description “Your port description here ” qinq vlan-translation enable undo port hybrid vlan 1 port hybrid tagged vlan 10 20 30 40 port vlan-mapping vlan 10 map-vlan 30 port vlan-mapping vlan 20 map-vlan 40 ntdp enable ndp enable bpdu enable trust 8021p Here …

by ShahedJanuary 7, 2011October 26, 20150

VLAN Mapping Cisco Switch Configuration: Today i will show you how to configure VLAN mapping cisco switch. [boxads] Here we Map Vlan 10 to VLAN 20 in Gigabit Ethernet port 0/1: Switch# configure terminal Switch(config)# interface gigabitethernet 0/1 Switch(config-if)# switchport mode trunk Switch(config-if)# switchport vlan mapping 10 20 Switch(config-if)# switchport vlan mapping 11 21 Switch(config-if)# switchport vlan mapping 12 22 Switch(config-if)# switchport vlan mapping drop default Switch(config-if)# end Switch# So all incoming Vlan 10 of gi0/1 interface is Converted/Translated to Vlan 20. same way Vlan 11, 12 mapping with 21, 22. How to verify the configuration: Switch# show vlan mapping or …

by ShahedJanuary 5, 2011February 3, 20160

Huawei Switch Configuration Tutorial: Today i will discuss how to configure a new huawei switch, so lets go our Huawei Switch Configuration Tutorial part…………[boxads] Procedure: Step 1: Connect the COM port on the PC and the console port on the switch by a cable. Step 2: Power on all devices to perform a self-check. Step 3: Run the terminal emulation program on the PC, setting the communication parameters as follows: -Baud rate: 9600 bps -Data bit: 8 -Stop bit: 1 -Parity: none -Flow control: none # Set system name / Host name: <Quidway> System-View [Quidway] sysname Switch-1 [Switch-1]quit

by ShahedJanuary 5, 2011October 30, 20150

Layer 2 Switching process Today I will discuss about Layer 2 Switching process. A Process of using the MAC address on LAN is called Layer 2 Switching. Layer 2 Switching is the process of using hardware address of devices on a LAN to segment a network. Switching breaks up large collision domains into smaller ones and that a collision domain is a network segment with two or more devices sharing the same bandwidth. [boxads] Ethernet is a LAN technology based on the IEEE 802.3 standard. It provides a shared medium to transfer the data. There are three Switching Modes: Cut …