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Exploring How Routing Works презентация
Содержание
- 1. Exploring How Routing Works
- 2. Outline Overview Routers Routers and the IP
- 3. Routers Linksys Cisco 2610 Router
- 4. router# show ip route
- 5. Routers and the IP Packet Delivery Process
- 6. Path Determination
- 7. Routing Tables
- 8. Routing Table Entries Directly connected: Router attaches
- 9. Routing Metrics
- 10. Distance Vector Routing Protocols Passes periodic copies
- 11. Link-State Routing Protocols After initial flood, passes small event-triggered link-state updates to all other routers
- 12. Summary Routers have certain components that are
- 13. Summary (Cont.) Routers determine the optimal path
- 14. Summary (Cont.) Distance vector routing protocols build
Outline Overview Routers Routers and the IP Packet Delivery Process Path Determination Routing Tables Static, Dynamic, Directly Connected, and Default Routes Dynamic Routing Protocols Summary Lab Exercise 4-1: Creating a Default
Слайд 2Outline
Overview
Routers
Routers and the IP Packet Delivery Process
Path Determination
Routing Tables
Static, Dynamic, Directly
Connected, and Default Routes
Dynamic Routing Protocols
Summary
Lab Exercise 4-1: Creating a Default Gateway
Dynamic Routing Protocols
Summary
Lab Exercise 4-1: Creating a Default Gateway
Слайд 4 router# show ip route
D 192.168.1.0/24 [90/25789217] via
10.1.1.1
R 192.168.2.0/24 [120/4] via 10.1.1.2
O 192.168.3.0/24 [110/229840] via 10.1.1.3
R 192.168.2.0/24 [120/4] via 10.1.1.2
O 192.168.3.0/24 [110/229840] via 10.1.1.3
1
2
Lets other routers know about changes
Determines where to forward packets
Router Functions
Слайд 5Routers and the IP Packet Delivery Process
1. Router receives frame.
2. Router
de-encapsulates the
frame and sees that it is a
packet.
3. Router checks to see if the
packet stays or goes to the next hop. If the packet needs to be forwarded, router consults the routing table.
4. If the packet stays, the
router uses ARP. If the
packet is to be forwarded,
the router uses MAC of
next hop.
5. Outgoing interface
encapsulates the packet
for correct media and
sends it out.
Слайд 8Routing Table Entries
Directly connected: Router attaches to this network
Static routing: Entered
manually by a system administrator
Dynamic routing: Learned by exchange of routing information
Default route: Statically or dynamically learned; used when no explicit route to network is known
Dynamic routing: Learned by exchange of routing information
Default route: Statically or dynamically learned; used when no explicit route to network is known
Слайд 10Distance Vector Routing Protocols
Passes periodic copies of routing table to neighbor
routes and accumulates distance vectors
Слайд 11Link-State Routing Protocols
After initial flood, passes small event-triggered link-state updates to
all other routers
Слайд 12Summary
Routers have certain components that are also found in computers and
switches. These components include the CPU, motherboard, RAM, and ROM.
Routers have these two primary functions in the IP packet delivery process: maintaining routing tables and determining the best path to used to forward packets.
Routers have these two primary functions in the IP packet delivery process: maintaining routing tables and determining the best path to used to forward packets.
Слайд 13Summary (Cont.)
Routers determine the optimal path for forwarding IP packets between
networks. Routers can use different types of routes to reach the destination networks, including static, dynamic, and default routes.
Routing tables provide an ordered list of best paths to known networks, and include information such as destination, next-hop associations, and routing metrics.
Routing algorithms process the received updates and populate the routing table with the best route.
Commonly used routing metrics include bandwidth, delay, hop count, and cost.
Routing tables provide an ordered list of best paths to known networks, and include information such as destination, next-hop associations, and routing metrics.
Routing algorithms process the received updates and populate the routing table with the best route.
Commonly used routing metrics include bandwidth, delay, hop count, and cost.
Слайд 14Summary (Cont.)
Distance vector routing protocols build and update routing tables automatically
by sending all or some portion of their routing table to neighbors. The distance vector routing approach determines the direction (vector) and distance to any network in the internetwork.
Link-state routing protocols build and update routing tables automatically, running the SPF algorithms against the link-state database to determine the best paths, and flood routing information about their own links to all the routers in the network.
Cisco developed EIGRP, which combines the best features of the distance vector and link-state routing protocol.
Link-state routing protocols build and update routing tables automatically, running the SPF algorithms against the link-state database to determine the best paths, and flood routing information about their own links to all the routers in the network.
Cisco developed EIGRP, which combines the best features of the distance vector and link-state routing protocol.
