Siemens S223, S323 user manual Address Resolution Protocol ARP, ARP Table

User Manual	UMN:CLI
SURPASS hiD 6615 S223/S323 R1.5

Sample Configuration

The latest policy is recorded as number 1. The following is an example of permitting MAC address 00:02:a5:74:9b:17 and 00:01:a7:70:01:d2 and showing table of filter policy.

SWITCH(bridge)# mac-filter add 00:02:a5:74:9b:17 permit

SWITCH(bridge)# mac-filter add 00:01:a7:70:01:d2 permit

SWITCH(bridge)# show mac-filter

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ID MAC ACTION

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1 00:01:a7:70:01:d2 PERMIT

2 00:02:a5:74:9b:17 PERMIT SWITCH(bridge)#

The following is an example of displaying one configuration.

SWITCH(bridge)# show mac-filter1

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ID MAC ACTION

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1 00:01:a7:70:01:d2 PERMIT SWITCH(bridge)#

7.13Address Resolution Protocol (ARP)

Device connected to IP network has two addresses, LAN address and network address. LAN address is sometimes called as data link because it is used in Layer 2 level, but more commonly the address is known as MAC address. Ethernet Switch needs 48-bit- MAC address to transmit packets. In this case, the process of finding proper MAC ad- dress from IP address is called as address resolution.

On the other hand, the progress of finding proper IP address from MAC address is called as reverse address resolution. Siemens switches find MAC address from IP address through address resolution protocol (ARP).

This chapter consists of these sections:

•ARP Table

•ARP Alias

•Gratuitous ARP

•Proxy-ARP

7.13.1ARP Table

Hosts typically have an ARP table, which is a cache of IP/MAC address mappings. The ARP Table automatically maps the IP address to the MAC address of a switch. In addition to address information, the table shows the age of the entry in the table, the encapsula- tion method, and the switch interface (VLAN ID) where packets are forwarded.

The hiD 6615 ARP saves IP/MAC addresses mappings in ARP table for quick search. Re- ferring to the information in ARP table, packets attached IP address is transmitted to net- work. When configuring ARP table, it is possible to do it only in some specific interfaces.

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