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VRRP Tutorial (Virtual Router Redundancy Protocol)

by ShahedJanuary 25, 2011October 30, 20150

VRRP Tutorial (Virtual Router Redundancy Protocol) Today i will discuss about VRRP Tutorial, VRRP stands for Virtual Router Redundancy Protocol. It is a FHRP: First Hop Redundancy Protocol, which means they allow you to configure more than one physical router but it can still be seen as a single router. First Hop means that any packet traveling out the network has its gateway as its first hop. It is protocol used for Gateway redundancy. [boxads] – It is similar to the HSRP protocol by Cisco – It is an open standard redundancy protocol i.e. can be used between different vendors …

by ShahedJanuary 17, 2011January 21, 20150

OSPF Network Types: [boxads] There are several kind of OSPF Network Types are use in service provider environment. OSPF message addresses are determined by the type of network to which the OSPF interface is connected. One of the following OSPF network types must be selected when configuring an interface on an OSPF router. Point-to-Point: A network that can connect only two routers. Leased-line WAN links such as Dataphone Digital Service (DDS) and T-Carrier are point-to-point networks. OSPF messages sent on point-to-point networks use IP multicast addresses. No DR/BDR concept. Has a Master and Slave concept instead, with highest interface chosing …

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 …