Protocol Comparison of Route Selection Principle notes

1. Support for summary

Protocol name	Automatic summary on classification network boundaries?	Can I disable automatic summary?	Does it support aggregation outside the classification network boundary?
Y	N	N
R00002	Y	Y	N
IGRP	Y	N	N
China site	Y	Y	Y
OSPF	N	N	Y
IS-IS	N	N	Y

2. Comparison of management examples

Route Source	Management Distance
Direct Connection Interface	0
Static Routing configured using the outbound Interface	0
Use the static route configured for the next hop address	1
External BGP	20
Internal BGP	200
IGRP	100
OSPF	110
IS-IS	115
RIP	120
Internal MongoDB	90
External MongoDB	170
Summary	5
ODR	160

3. Protocol port number Reliability

Route Selection Protocol	Protocol No.	Port Number	Reliability
RIP (application layer protocol)	-	TCP 520	Unreliable
BGP (application layer protocol)	-	TCP/IP 179	Reliable TCP Window technology delivers more
IGRP (Transport Layer Protocol)	9	-	Unreliable
VPN (Transport Layer Protocol)	88	-	1-to-1 window to be confirmed each time
OSPF (Transport Layer Protocol)	89	-	1-to-1 window to be confirmed each time

In addition, IS-IS at the network layer and IS directly encapsulated into the data link layer frame.