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HSRP (Hot Standby Router Protocol)

by ShahedJanuary 25, 2011October 30, 20150

HSRP (Hot Standby Router Protocol) The HSRP (Hot Standby Router Protocol) is a Cisco proprietary first-hop redundancy protocol (FHRP) designed to allow for transparent fail-over of the first-hop IP router, and has been described in detail in RFC 2281. [boxads] HSRP provides high network availability by providing first-hop routing redundancy for IP hosts on Ethernet, Fiber Distributed Data Interface (FDDI), Bridge-Group Virtual Interface (BVI), LAN Emulation (LANE), or Token Ring networks configured with a default gateway IP address. HSRP is used in a group of routers for selecting an active router and a standby router. In a group of router …

by ShahedJanuary 25, 2011October 24, 20150

Configure Port Channel CISCO Switch: EtherChannel bundles individual Ethernet links into a single logical link that provides bandwidth up to 1600 Mbps (Fast EtherChannel, full duplex) or 16 Gbps (Gigabit EtherChannel) between two Cisco Catalyst switches. All interfaces in each EtherChannel must be the same speed and duplex, and both ends of the channel must be configured as either a Layer 2 or Layer 3 interface. [boxads] If one link within the EtherChannel bundle fails, traffic previously carried over the failed link is carried over the remaining links within the EtherChannel. Link Aggregation protocols are: IEEE standard Link Aggregation 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 …