Почитал http://www.opennet.dev/openforum/vsluhforumID6/2498.html
пробую у себя:
на 2611 в конфигурации interface ethernet 0/0.2, команда encapsulation вообще не вводится, а при ip address 1.1.1.1 255.255.255.0

Configuring IP routing on a LAN subinterface is only allowed if that
subinterface is already configured as part of an IEEE 802.10, IEEE 802.1Q, or IS
L vLAN.

Я где то еще должен прописать vLAN,или он все таки он не суппортится vLAN?

--
sh int eth 0/0
Ethernet0/0 is up, line protocol is up
  Hardware is AmdP2, address is 00b0.6454.9fa0 (bia 00b0.6454.9fa0)
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output 00:00:04, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue :0/40 (size/max)
  5 minute input rate 1000 bits/sec, 2 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     24818 packets input, 2299333 bytes, 0 no buffer
     Received 22307 broadcasts, 0 runts, 0 giants, 0 throttles
     4 input errors, 4 CRC, 3 frame, 0 overrun, 0 ignored
     0 input packets with dribble condition detected
     3281 packets output, 290294 bytes, 0 underruns
     107 output errors, 0 collisions, 5 interface resets
     0 babbles, 0 late collision, 0 deferred
     107 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out
--
sh ver
Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-I-M), Version 12.2(8)T5,  RELEASE SOFTWARE (fc1)
TAC Support: http://www.cisco.com/tac
Copyright (c) 1986-2002 by cisco Systems, Inc.
Compiled Fri 21-Jun-02 08:50 by ccai
Image text-base: 0x80008074, data-base: 0x80A2BD40

ROM: System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1)

gw-ul-01 uptime is 3 hours, 58 minutes
System returned to ROM by power-on
System image file is "flash:c2600-i-mz.122-8.t5.bin"

cisco 2611 (MPC860) processor (revision 0x203) with 28672K/4096K bytes of memory
.
Processor board ID JAD035105MN (3214381047)
M860 processor: part number 0, mask 49
Channelized E1, Version 1.0.
Bridging software.
X.25 software, Version 3.0.0.
Primary Rate ISDN software, Version 1.1.
2 Ethernet/IEEE 802.3 interface(s)
1 Serial network interface(s)
32K bytes of non-volatile configuration memory.
16384K bytes of processor board System flash (Read/Write)

Configuration register is 0x2102
--
Спасибо.

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