如何使用 SNMP OID 轮询 ARP 表？

Question

当您需要轮询设备的 ARP 表时，传统观点是使用ipNetToMediaPhysAddress或atPhysAddress；但是，根据 Cisco 的文档，这两个 OID 均已弃用。

这些 OID 工作得很好；但是，我正在构建一个新工具，因此如果可能，使用最新的 OID 是有意义的。

是否有未弃用的 SNMP OID 来查询设备中的 ARP 表？到目前为止，谷歌还没有为我提供这个答案......

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Mircea 的答案在较新的 IOS 上运行良好...

[mpenning@something]$ snmpbulkwalk -v 2c -c public -Osq 192.0.2.1 ipNetToPhysicalPhysAddress
ipNetToPhysicalPhysAddress.2.ipv4."192.0.2.1" a4:4c:11:90:56:80
ipNetToPhysicalPhysAddress.2.ipv4."192.0.2.2" a4:4c:11:96:68:0
ipNetToPhysicalPhysAddress.2.ipv4."192.0.2.101" 0:90:b:43:80:74
[mpenning@something]$ snmpbulkwalk -v 2c -c public -Oqv 192.0.2.1 sysDescr
Cisco IOS Software, C3900 Software (C3900-UNIVERSALK9-M), Version 15.2(2)T1, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2012 by Cisco Systems, Inc.
Compiled Wed 29-Feb-12 23:44 by prod_rel_team
[mpenning@something]$

较旧的 IOS 需要使用 ipNetToMediaPhysAddress

Answer 1

您应该ipNetToPhysicalTable按照RFC 4293 的定义使用。于是ipNetToMediaPhysAddress变成ipNetToPhysicalPhysAddress

 ipNetToMediaTable OBJECT-TYPE
     SYNTAX     SEQUENCE OF IpNetToMediaEntry
     MAX-ACCESS not-accessible
     STATUS     deprecated
     DESCRIPTION
            "The IPv4 Address Translation table used for mapping from
             IPv4 addresses to physical addresses.

             This table has been deprecated, as a new IP version-neutral
             table has been added.  It is loosely replaced by the
             ipNetToPhysicalTable."
     ::= { ip 22 }