Using line Backup to achieve high availability of enterprise wide area Network

First, the principle of summary:

High Availability Network:

1, Server aspects: cluster; "lb load balanced ha high availability hp high performance"

2, the router aspect: HSRP, VRRP;

3, network interface: Multi-card binding "bond";

4, Link aspect:

LAN LAN: Port aggregation, spanning tree (STP, RSTP, MSTP)

Wide Area Network WAN: line backup;

There are three ways to back up a line:

1. Floating Static route

Floating static routing is a special static route that provides backup routing by configuring a static route that is larger than the master route Management distance to ensure the failure of the primary route in the network.

2. Backup link

The High availability of network connection is achieved by backing up a link to the main link;

3. PPP Link Bundle

PPP Link Bundle:

Point-to-Point Protocol (PPP) provides a standard method for the transmission of multi-protocol packets over point-to-point connections. PPP was originally designed to provide an encapsulation protocol for IP traffic transmission between two peer nodes.

Multilink PPP is usually used in the user's original PPP link bandwidth is sufficient, and then apply to see a new PPP link. Multilink PPP technology can be used for the purpose of not making changes to the original configuration, and two PPP links can be exploited.

When Multilink PPP is configured on the router, a new PPP Multilink interface (Multilink-group Interface) is formed on the router. This interface contains various configurations for PPP protocols that look at other common PPP interfaces. such as IP addresses are configured on this PPP template interface. In this way, the router is equivalent to someone with a large bandwidth of the PPP interface.

Although the current data link bandwidth is increasing, multilink PPP uses a narrower range, but Multilink PPP has its own some of the somewhat:

(1) Increase bandwidth

Multiple PPP links are bundled to increase the existing PPP link faster and use an IP address without having to configure each PPP link. Multi-link PPP can dynamically increase or decrease bandwidth if combined with dynamic dialing

(2) Load sharing

Multi-Link PPP can realize the load sharing of messages on different PPP links. For the high speed PPP link, the transmission of the message to thank, for the low speed PPP link, the transmission of the message will be smaller.

(3) Reduce time delay by slicing

When a message is transmitted over a multilink PPP, it is usually divided into multiple slices that are transmitted simultaneously across the Multilink path. So for the larger message,. Can reduce the transmission delay.

(4) PPP Multilink protocol Its best feature is that he can have Multilink redundancy, which means that a physical link down or corrupted does not affect the transmission of data.