HCDP笔记（HCDP notes）.docVIP

HCDP笔记（HCDP notes） Mux vlan is mainly vlan and from vlan, and vlan is classified into intercommunication and isolation. The main vlan and the vlan can communicate with each other, and the intercommunication can communicate with each other from the ports in the vlan. The isolation type cannot communicate with each other from the ports in the vlan, and there is no communication between the vlans. Arp enables normal communication between hosts in different physical networks but with the same network number. The routing arp proxy solves the problem of communication between computers on different physical networks in the same network segment. Vlan internal arp proxy solves the same vlan, and vlan configures user isolated network for computer communication problems. The arp proxy in vlan solves the problem of intercommunication between different vlans. (the vlanif interface of the super vlan can initiate the vlan proxy arp function to realize the user interaction between sub vlan) Super vlan solves the problem of IP address resource waste. The vlan used to isolate broadcast domains is called sub-vlan, and the vlan corresponding to the subnet is called super-vlan, and multiple sub-vlans make up a super-vlan. Vlan mapping implements a function of user vlan and business vlan transformation. Int gi 0/0/1 qinq vlan-translation enable enables interface vlan transformation capabilities Port vlan-mapping vlan 1 to 20 map-vlan 100 Port isolation is an access control security control mechanism between switch ports Global port-mode enable configuration port isolation mode Port - use mode enable enable The qinq protocol encapsulates the public network vlan tag outside the vlan tag of the users private network, and in the public network, it is reported to be spread by the public network vlan tag. Qinq provides users with a simpler two-story VPN tunnel. Qinq is based on 802.1 q encapsulation The message encapsulates a double-layer vlan tag outer tag layer tag Qinq implementation mode B