[2015-09-04] Routing Basics (1)

1, the ad value of the route and the metric value: Ad range (0--255) 255 distrust is not considered used; the same protocol the same AD value metric the smaller the higher the priority;

2. Ad values for common routing entries: static--1, Direct connect--0, EIGRP-90 external 170 Rollup 5, OSPF-110, ISIS-115, rip--120 BGP (200 20)

Metric: Measure the path good or bad, rip: Hop number 16 jump for unreachable;? OSPF cost=100m/true bandwidth; EIGRP five k values (load, bandwidth, latency, reliability, MTU)

3, DHCP message: Discover, offer, request, ACK?; Port number: Dhcp-server client-68

4,? Static routing configuration: out interface + Next hop, followed by only the interface will cause the ARP table key expansion;

5, Static Summary routing: Network segment summary, can also configure default routes, advantages: Reduce local topology changes, reduce the number of local subnets

6, floating static approach:? By modifying the ad value implementation of a static route

7, when the non-directly connected interface State is not perceptible, can be defined tracking engineering, detection, the specific configuration is as follows:

Enable SLAs, define the use of certain traffic, set the frequency, set the start time of the SLA, and cut the SLA in track?

Routing under associated track, you can open the debug IP ICMP for testing using the scene under the main backup line to switch, when the main line of the upper end of the failure to perceive, can use the traffic engineering to detect to achieve the main line down fast switch to the back line

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[2015-09-04] Routing Basics (1)