1, have the characteristics of the type of routing protocol is the time to send routing updates don't carry the routing entry subnet mask
2, have a kind of routing protocol used in the routing process routing rules to send and receive,
Have a kind of routing protocol to send the rules: check whether the routing update network is main port and send the same 1). If no, routing updates automatically rolled into the main class 2). The network if it is, continue to check the routing update and send the mask of the interface is consistent a. is sending update b. no, ignore update
Have a kind of routing protocol to update the receiving rules: the network address and receive the network address of the interface comparison, determine whether in the same main network 1). In the same main network, directly to the network address to receive the mask of the interface and written to the routing table 2). Not in the same main network, first check whether there is the main network in the routing table a. any subnet does not exist, receives the network addresses, and gives the network address a kind of mask, and written to the routing table b. there, ignore this update and discarded
3, have a kind of routing protocol features: 1) under the same main network if the subnet mask, then there will be a subnet is missing, which does not support VLSM 2) on the border routers can produce automatic summary, and this summary cannot be shut down automatically, for discontinuous subnet, bound to lead to multiple routers notice the same routing updates (summary), it will lead to the network is not normal, so do not support the discontinuous subnet, continuous subnet, is support, 3) as a kind of routing protocol includes: RIPV1 IGRP
Classful routing protocol (2)
1, the characteristic of classful routing protocols is the time to send routing updates to carry their own subnet mask
2, classful routing protocols features: 1) because send the subnet mask, can support VLSM, 2) summary can be turned off automatically at the top of the border router, can support the discontinuous subnet, 3) classful routing protocols include: RIPV2 EIGRP OSPF ISIS BGPV4 4) based on the network segment now we use are generally VLSM, so, we will now use a class of routing protocols,
Summary: is there a kind of routing protocol and is the essential difference between classful routing protocols send routing updates on whether or not send the subnet mask, so there are different classes without agreement lies in whether to support VLSM (variable-length subnet mask), have a class not send mask, does not support VLSM, no class on the other hand, by default, there is no such agreement and have a class, on the border routers, automatically collect (OSPF is not automatically collect border), a kind of routing protocol, summary do not shut down automatically, so do not support the discontinuous subnet. No such agreement can be shut down this damn automatic summary function, to switch to manual mode to carry on the summary, so support discontinuous subnet,
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