Router

Basic setup

• show ip route summary

Administrative Distance

Routing Protocol	AD
Directly connected interface	0
Static route	1
OSPF	110
RIP	120

Static Route

• ip route 172.16.0.0 255.255.0.0 e0/0 192.168.12.2
• ip route 0.0.0.0 0.0.0.0 e0/0 192.168.12.2
• ip route 0.0.0.0 0.0.0.0 e0/1 192.168.13.3 10

OSPF (Open Shortest Path First)

• router ospf 1 // router ospf process-id
• interface fastEthernet 0/1
• ip ospf 1 area 0
• ip ospf cost 1
• interface fastEthernet 0/2
• ip ospf 1 area 0
• ip ospf cost 2
• interface vlan 10
• ip ospf 1 area 1
• router ospf 1
• passive-interface vlan 10
• show ip ospf interface brief
• show ip ospf neighbor
• show ip route ospf
• reference-bandwidth (100 Mbps by default)
  • router ospf 1
  • auto-cost reference-bandwidth 1000 (The reference bandwidth in terms of Mbits per second)
  • interface fastEthernet 0/1
  • bandwidth 100000 (Bandwidth in kilobits)
  • Cost = reference-bandwidth / bandwidth

NAT

• interface Ethernet0
  • ip address 192.168.1.1 255.255.255.0
  • ip nat inside
• interface Ethernet1
  • ip address 211.120.200.2 255.255.255.0
  • ip nat outside
• ip nat inside static 192.168.1.100 211.120.200.100
• show ip nat translations

ACL

• FTP (Active Mode)
  • access-list 102 permit tcp any host 192.168.1.100 eq ftp
  • access-list 102 permit tcp any host 192.168.1.100 eq ftp-data established
• FTP (Passive Mode)
  • access-list 102 permit tcp any host 192.168.1.100 eq ftp
  • access-list 102 permit tcp any host 192.168.1.100 gt 1024
• SMTP
  • access-list 102 permit tcp any host 192.168.1.100 eq smtp

• https://www.cisco.com/c/zh_cn/support/docs/ip/access-lists/26448-ACLsamples.html