Network engineers should know the 10 routers knowledge

Sept. 17, 2013 - PRLog -- 1, when using a routing protocol?

When two different routing protocol to JC099A (http://www.h3network.com/hp-jc099a-s5800-32c-pwr-price_p6.html) exchange routing information, will use more routing protocol. Of course, routing redistribution can also exchange routing information. The following conditions without the use of multiple routing protocols:

From the internal gateway protocol version of the old (Interior Gateway Protocol, I G P) to upgrade to the new version of I G P.

You want to use another routing protocol but must keep the original agreement.

You want to terminate the internal routing, in order to avoid interfering with other no strict supervision function of the filter router.

You are in a multi vendor router environment.

2, how to create a IP standard access list?

A I P standard access list can be created by the following command to complete theAccess-list access list number {permit |: deny} source [source-mask]

In this command:

The access list number: determines the entrance which belong to the access table. It is from1 to 99 the number of.

The permit | deny: suggest that this entrance to allow or block information flow from a specific address.

The source: determine the source I P address.

The s o u r c e m a s k: to determine which bits in the address is used for matching. If a bit is" 1", that address the a bit don't tube, if " 0" words, show that address the bit will be used for matching. You can use wildcards.

The following is a router configuration file access table example:

Router# show access-lists

Standard IP access list 1

Deny 204.59.144.0, wildcard bits 0.0.0.255

Ermit any

3, when the use of routing redistribution?

Routing redistribution usually in those responsible for learning a route from an autonomous system, and then to another autonomous system broadcast router. If you are using I G R Por E I G R P, routing redistribution is usually carried out automatically.

4, how to configure redistribution?

Before routing redistribution, you must first:

1) decided where to add new agreement.

2) determine the autonomous system boundary router (ASBR).

3) determine which protocol in the core, which in the border.

4) decided to carry out the direction of redistribution routing.

You can use the following command redistribution routing update (this example is for OSPF):

Router (config-router) #redistribute protocol [process-id] [metric metric - value [metric-typetype - [subnets] value]]

In this order:

Source routing protocol of protocol: indicates that the router for routing redistribution.

The main values are: BGP, EqP, IGRP, Isis, OSPF, static [IP], connected and rip.

The process-id: indicates the OSPF process ID.

The metric: is an optional parameter, metric value used to specify the routing redistribution.Measure the default is 0.

5, the distance vector routing protocol and link state routing protocol to found adjacent to the router?

The use of distance vector routing protocol router to create a routing table (including directly connected with its network), and it will be sent to the routing table is directly connected withits router. Adjacent to the router will receive the routing table into its own route table, at the same time, it also will own route table is sent to its adjacent routers. The use of link state routing protocol router to create a link state table list, including the entire network destination station. In the update message, each router sends its entire list. When the adjacent to therouter receives the update message, it will copy the content, at the same time, the information is sent to neighboring stations it. In the routing table content without necessary tocalculate.

Note the use of IGRP and EIGRP routers broadcast Hello messages to find neighbors, alsolike OSPF exchange routing updates. EIGRP for each network layer protocol maintains aneighbor table, which includes the adjacent station address, wait in the queue for the number of transmitted messages, from the adjacent station receiving or sending messages to theadjacent station, the average time, and not before determining the link disconnected from theadjacent station received any message time.

6, the routing loop is how to produce?

Because the network routing convergence time, routing routing table or change can not bequickly within the network stability, making it inconsistent routing, so will produce a routing loop.

34, Ethernet Channel Tech. can be used in any network equipment? How to use?

Can be used in the switch between, between the switch and the router, switch and server

Can be 2 or 4 10/100Mbps or 1000Mbps port using Ethernet Channel Tech., up to 400M(10/100Mbps port), 4G (1000Mbps port) or 800M (10/100Mbps port), 8G (1000Mbps port)bandwidth.

7, the Ethernet Channel Technology what effect is there?

Increasing the bandwidth, load balancing, line backup

8, when the port is set to Ethernet Channel, how to select the line?

According to the source address of Ethernet data frames and a destination address of the last 1 bit or 2 bit or operation, determine the output from which link. The router is according to the network address or operation, to decision output link.

9, Ethernet Channel Technology and PAgP (Port Aggregation Protocol) difference?

PAgP is an enhanced version of the Ethernet Channel, which are supported in the EthernetChannel Spanning Tree Protocol and Uplink Fast, and supports automatic configurationEthernet Channel binding.

The power number 12 at least.

Packet forwarding rate 18Mpps 18Mpps

Backplane bandwidth 24Gbps 60Gbps

10, in the switch between the Uplink-Fast configuration, you want to close the Spanning-Tree options? Don't need, Uplink-Fast actually uses a simplified Spanning-Tree algorithm,compatible with standard Spanning-Tree, so it is not necessary to JEO66A (http://www.h3network.com/hp-je066a-s5120-24p-ei-h3-price_...) shut down the function.

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