升级IOS后，Router的端口增加了，怎么回事？

好不容易找到一台C831练手，刚拿到就升级了一下IOS，原来的版本太低了，升级后发现一些问题请教一下大家。
原IOS版本：c831-k9o3y6-mz.123-2.XC2.bin
新IOS版本：c831-k9o3sy6-mz.124-12c.bin
问题：
原版本软件show interface显示：
CISCO C831 (MPC857DSL) processor (revision 0x500) with 58983K/6553K bytes of mem
ory.
Processor board ID FHK092021FZ (2559971634), with hardware revision 0000
CPU rev number 7
Bridging software.
2 Ethernet/IEEE 802.3 interface(s)
4 FastEthernet/IEEE 802.3 interface(s)
128K bytes of non-volatile configuration memory.
12288K bytes of processor board System flash (Read/Write)
2048K bytes of processor board Web flash (Read/Write)
Configuration register is 0x2102
新版本软件show interface显示：
Cisco C831 (MPC857DSL) processor (revision 0x500) with 58983K/6553K bytes of mem
ory.
Processor board ID FHK092021FZ, with hardware revision 0000
CPU rev number 7
3 Ethernet interfaces
4 FastEthernet interfaces
128K bytes of NVRAM.
12288K bytes of processor board System flash (Read/Write)
2048K bytes of processor board Web flash (Read/Write)
Configuration register is 0x2102
怎么会多出一个Ethernet interface？

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who can help me?

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实际是多少个以太口

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QUOTE:原帖由 ssffzz1 于 2007-11-22 17:15 发表
实际是多少个以太口
加上管理端口和WAN口，一共6个端口。
实际可以使用的只有4个。
eth0-eth4

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