My Netwok Dictionary

To enable interoperability of management in the different network platforms have been established network management standards for providers to implement and comply with them.

There are two main standards:

• Simple Network Management Protocol (SNMP) – Community of IETF
• Common Management Information Protocol (CMIP) – Community of telecommunications.

SNMP actually refers to a set of standards for network management which includes a protocol, a specification of the structure of the database and a set of data objects. The SNMP was adopted as a standard for TCP/ IP in 1989 and became very popular. In 1993 it adopted an update known as the SNMP version 2c (SNMPv2c). Read the rest of this entry »

From the point of view, telephone, the protocol takes care of the voice signal for the establishment, management and culling call is SIP (Session Initiation Protocol). It is a protocol developed by IETF as a standard (RFC 3261) and supported in the client’s on-board mobile phone from Nokia.

The same SIP, then handles the message from the server side, ie the IP PBX, Cisco. The router in fact, the CME configuration, you can use two main VoIP protocols: a Cisco proprietary protocol called Skinny Protocol (SCCP), which is precisely the SIP. For an introduction to the protocol from the point of view, Cisco, see the documents listed on the site. Read the rest of this entry »

This article teaches how to create a logical topology without loops. Redundant network topologies are designed to ensure that networks continue to function in the presence of single points of failure. The users’ work suffers fewer interruptions as the network continues to function. Any disruption caused by a fault should be as short as possible.

Reliability increases due to redundancy. A network based on switches or bridges present redundant links between those switches or bridges to overcome the failure of a single link. These connections introduce physical loops in the network. These bridging loops are created so that if one link fails, another link may take over the function of sending traffic. Read the rest of this entry »

This article describes the Rapid Spanning-Tree Protocol.

• The Rapid Spanning Tree Protocol defined in IEEE 802.1w LAN standard. The standard and protocol introduce new features: clarification of port states and roles.
• Definition of a set of link types that can move quickly to the state sent.
• The concept of allowing switches in a network in which there is convergence generates BPDUs instead of transferring the root bridge BPDUs.

Read the rest of this entry »

PPP uses a layered architecture. The layered architecture is a model, logical design or plan that helps communication between interconnected layers. The model for Open Systems Interconnection (OSI) layered architecture is used in networking. PPP provides a method for encapsulating multi-protocol datagrams on a link from point to point and uses the data link layer to test this connection. Therefore, PPP is composed of two sub-protocols:

• Link Control Protocol, is used to establish the link point to point.
• Network Control Protocol is used to configure different network layer protocols.

You can configure PPP on the following types of physical interfaces:

• Serial asynchronous
• Serial synchronous
• High Speed Serial Interface (HSSI)
• Integrated Services Digital Network (ISDN)

PPP uses the Link Control Protocol (LCP) to negotiate and configure the link control data from the WAN. PPP uses the component of the Network Control Protocol (NCP) to encapsulate and negotiate options for different network layer protocols. The PCL is located at the top of the physical layer and is used to set up, configure and test the data link connection. Read the rest of this entry »

For the NMS communicates with network devices, its must enable and configure your SNMP community strings. These devices are configured using the commands described in the paragraphs below.

It allows more than one read-only string. In most systems this community string is public by default. Not recommend using the default on corporate networks. To set the community string read-only be used by the agent, use the following command:

Router (config) # snmp-server community string ro

• String: The community string that acts as a password and gives you access to the SNMP protocol.

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If using a PLIP link to connect two machines, things are a little different from that seen in an Ethernet. PLIP If a link is known as point-to-point, which means that only one machine at each end of the link. A network like Ethernet is called broadcast networks. The configuration of point to point links is different because unlike broadcast networks, the links are point to point network themselves.

PLIP provides very cheap and portable connection between computers. As an example, consider a laptop from an employee at the Virtual Brewery that is connected to vlager via PLIP. The laptop is called vlite and has only one parallel port. During startup, this port will be registered as plipl. To activate the link, you have to configure the interface using the following commands: Read the rest of this entry »

The rapid growth of the Internet has left stunned most observers. One of the reasons why the Internet has grown so quickly is due to the flexibility of the original design. Without the development of new technologies for IP address assignment, the rapid growth of the Internet would have exhausted the current number of IP addresses. To compensate for this lack of IP addresses, we searched for different solutions. One solution widely deployed, is the Network Address Translation (NAT).

NAT is a mechanism for conserving registered IP addresses in large networks and simplifying management tasks IP address. Tools package is routed through a network device, usually a border router or firewall, the source IP address is translated from a private internal network address to a routable public IP address. Read the rest of this entry »

Despite the complexity of DUAL, configuring EIGRP can be relatively simple. The EIGRP configuration commands vary according to the protocol to be routed. Some examples of these protocols are IP, IPX and AppleTalk. This article describes how to configure EIGRP for IP protocol.

Follow these steps to configure EIGRP for IP routes:

1. Use the following to enable EIGRP and define the autonomous system:

router (config) # router eigrp autonomous-system-number

The autonomous system number is used to identify all routers belonging to the internetwork. This value must match all routers within the internetwork. Read the rest of this entry »

Sometimes it is useful to view or alter the content of the kernel ARP tables, for example, when you suspect a duplicate IP address is the home of an intermittent problem on your network. The arp tool was made for situations like this. Your options are: arp [-v] [-t tipohw]-[machine] arp [-v] [-t tipohw]-s machine direccionhw arp [-v]-d machine [machine...]

All arguments hostname can be symbolic names or IP addresses in dotted quad notation. The first command displays the table row corresponding to the specified IP address or machine, or if none is passed, will display all records. For example, invoking arp in vlager would get: showing vlager, vstout and vale Ethernet addresses. The list can be limited to a hardware type specified using the option -t. The possible values are ether, ax25, or ProNet, and refer to 1 0Mbps Ethernet, AMPR AX.25, and IEEE 802.5 token ring equipment, respectively.

The option-s is used to permanently add the Ethernet address of the machine specified the ARP tables. The argument specifies hardware address, which by default is supposed to be an Ethernet address specified as six hexadecimal bytes separated by colons. You can even define the hardware addresses for other types of hardware, using the option -t. Read the rest of this entry »