The ifXTable is a list of interface entries, the number of which is determined by the value of ifNumber.
The ifXTable Extended MIB is specified in RFC 2863, which also specifies the Interface Group MIB. Extreme 9920 software supports the following.
| Name | OID | Syntax | comments |
| ifName | .1.3.6.1.2.1.31.1.1.1.1 | DisplayString (Octet string) | Name of the interface |
| ifInMulticastPkts | .1.3.6.1.2.1.31.1.1.1.2 | Counter32 | Number of packets addressed to a multicast address at this sublayer |
| ifInBroadcastPkts | .1.3.6.1.2.1.31.1.1.1.3 | Counter32 | Number of packets addressed to a broadcast address at this sublayer |
| ifOutMulticastPkts | .1.3.6.1.2.1.31.1.1.1.4 | Counter32 | Number of packets requested by a higher-level protocol that were addressed to a multicast address at this sublayer |
| ifOutBroadcastPkts | .1.3.6.1.2.1.31.1.1.1.5 | Counter32 | Number of packets requested by a higher-level protocol that were addressed to a broadcast address at this sublayer |
| ifHCInOctets | .1.3.6.1.2.1.31.1.1.1.6 | Counter64 | Number of octets received on the interface |
| ifHCInUcastPktss | .1.3.6.1.2.1.31.1.1.1.7 | Counter64 | Number of unicast packets delivered by the sublayer to a higher sublayer |
| ifHCInMulticastPkts | .1.3.6.1.2.1.31.1.1.1.8 | Counter64 | Number of multicast packets delivered by the sublayer to a higher sublayer |
| ifHCInBroadcastPkts | .1.3.6.1.2.1.31.1.1.1.9 | Counter64 | Number of broadcast packets delivered by the sublayer to a higher sublayer |
| ifHCOutOctets | .1.3.6.1.2.1.31.1.1.1.10 | Counter64 | Number of octets sent from the interface |
| ifHCOutUcastPkts | .1.3.6.1.2.1.31.1.1.1.11 | Counter64 | Number of packets requested by a higher-level protocol that were addressed to a unicast address at this sublayer |
| ifHCOutMulticastPkts | .1.3.6.1.2.1.31.1.1.1.11 | Counter64 | Number of packets requested by a higher-level protocol that were addressed to a multicast address at this sublayer |
| ifHCOutBroadcastPkts | .1.3.6.1.2.1.31.1.1.1.12 | Counter64 | Number of packets requested by a higher-level protocol that were addressed to a broadcast address at this sublayer |
| ifLinkUpDownTrapEnable | .1.3.6.1.2.1.31.1.1.1.13 | Integer | Indicates whether linkUp and linkDown traps are generated for the interface |
| ifHighSpeed | .1.3.6.1.2.1.31.1.1.1.14 | Gauge32 | Estimation of the interface's current bandwidth |
| ifPromiscuousMode | .1.3.6.1.2.1.31.1.1.1.16 | TruthValue | Value of false (2) if the interface accepts only those packets or frames that are addressed to the interface. Value of true (1) if the interface accepts all packets and frames. |
| ifConnectorPresent | .1.3.6.1.2.1.31.1.1.1.17 | TruthValue | Value of true (1) if the sublayer has a physical connector. Value of false (2) if the sublayer does not have a physical connector. |
| ifAlias | .1.3.6.1.2.1.31.1.1.1.18 | DisplayString | Alias for the interface, as specified by the network manager |
| ifCounterDiscontinuityTime | .1.3.6.1.2.1.31.1.1.1.19 | TimeStamp | Value of sysUpTime at the most recent occurrence of discontinuity for any of the interface's counters |