frame value too large by ifconfig!!!!

my NIC doesn't work .My os is RHEL5.1/32bit/dual core intel cpu. the
ifconfig output:

eth2 Link encap:Ethernet HWaddr 00:55:7B:B5:7D:F7
inet addr:192.168.1.22 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::255:7bff:feb5:7df7/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1 errors:0 dropped:0 overruns:0 frame:21668
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:60 (60.0 b) TX bytes:0 (0.0 b)
Interrupt:169


why the frame value(21668) so large?

lspci -vvv


03:00.0 Ethernet controller: ABC Networks Inc Unknown device 0003 (rev
01)
Subsystem: Airgo Networks Inc Unknown device 0003
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr+
Stepping- SERR+ FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 169
Region 0: Memory at b8900000 (32-bit, non-prefetchable) [size=64K]
Expansion ROM at 40000000 [disabled] [size=64K]
Capabilities: [40] Power Management version 2
Flags: PMEClk- DSI- D1+ D2- AuxCurrent=375mA PME(D0+,D1+,D2-,D3hot
+,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [50] Message Signalled Interrupts: 64bit+ Queue=0/0
Enable-
Address: 0000000000000000 Data: 0000
Capabilities: [70] Express Legacy Endpoint IRQ 0
Device: Supported: MaxPayload 256 bytes, PhantFunc 0, ExtTag-
Device: Latency L0s <1us, L1 <8us
Device: AtnBtn- AtnInd- PwrInd-
Device: Errors: Correctable+ Non-Fatal+ Fatal+ Unsupported-
Device: RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+
Device: MaxPayload 128 bytes, MaxReadReq 512 bytes
Link: Supported Speed 2.5Gb/s, Width x1, ASPM L0s L1, Port 0
Link: Latency L0s <512ns, L1 <64us
Link: ASPM Disabled RCB 64 bytes CommClk- ExtSynch-
Link: Speed 2.5Gb/s, Width x1
.

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