может и mtu сверим ?
vlan9: flags=8843 metric 0 mtu 1500
options=3
ether c8:60:00:e3:1c:8b
inet 213.156.93.234 netmask 0xffffff00 broadcast 213.156.93.255
inet6 fe80::ca60:ff:fee3:1c8b%vlan9 prefixlen 64 scopeid 0xa
nd6 options=29
media: Ethernet autoselect (1000baseT <full-duplex>)
status: active
vlan: 9 parent interface: re0
sh interfaces Fa0/12
FastEthernet0/12 is up, line protocol is up (connected)
Hardware is Fast Ethernet, address is 10bd.181d.c78c (bia 10bd.181d.c78c)
Description: "itercom"
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 5/255, rxload 8/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, media type is 10/100BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:05, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 2343
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 3481000 bits/sec, 412 packets/sec
5 minute output rate 2264000 bits/sec, 441 packets/sec
18715921 packets input, 10135875457 bytes, 0 no buffer
Received 20406 broadcasts (0 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
0 input packets with dribble condition detected
31393519 packets output, 29632258489 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out
на интерфейсе вижу 2 мас-а
sh mac address-table interface Fa0/12
Mac Address Table
-------------------------------------------
Vlan Mac Address Type Ports
---- ----------- -------- -----
9 0c85.25c8.d88a DYNAMIC Fa0/12
9 70ca.9b86.a8e1 DYNAMIC Fa0/12
Total Mac Addresses for this criterion: 2
