3com (c16475) + cisco 2950, ​​3com does not pass cisco traffic?

Question

Iron

There is such a piece of iron 3com (c16475), behind it is a router with dhcp. In 3com included cisco catalyst 2950. On cisco port in trunk, other access ports, all ports in vlan 1. The internal network works, that is between the computers connected to cisco a network is. Actually the problem is, I don’t see everything for 3com anymore, there are several more segments of the same network. Previously, instead of a cisco table, here is such a surecom ep piece of iron - 816vx, an ordinary unmanaged switch. What could be the problem?
show startup-config
spanning-tree mode pvst
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
!
!
interface FastEthernet0/1
switchport trunk allowed vlan 1
switchport mode trunk
switchport nonegotiate
!
interface FastEthernet0/2
switchport mode access
!
interface FastEthernet0/3
switchport mode access
!
interface FastEthernet0/4
switchport mode access
!
interface FastEthernet0/5
switchport mode access
!
interface FastEthernet0/6
switchport mode access
!
interface FastEthernet0/7
switchport mode access
!
interface FastEthernet0/8
switchport mode access
!
interface FastEthernet0/9
switchport mode access
!
interface FastEthernet0/10
switchport mode access
!
interface FastEthernet0/11
switchport mode access
!
interface FastEthernet0/12
switchport mode access
!
interface FastEthernet0/13
switchport mode access
!
interface FastEthernet0/14
switchport mode access
!
interface FastEthernet0/15
switchport mode access
!
interface FastEthernet0/16
switchport mode access
!
interface FastEthernet0/17
!
interface FastEthernet0/18
!
interface FastEthernet0/19
!
interface FastEthernet0/20
!
interface FastEthernet0/21
!
interface FastEthernet0/22
!
interface FastEthernet0/23
!
interface FastEthernet0/24
!
interface Vlan1
ip address 192.168.114.254 255.255.240.0
no ip route-cache
!
ip default-gateway 192.168.112.1
ip http server

Answer 1

1 port in switchport mode access, because since it was unmanaged, no trunk was configured in 3COM.
Or start a trunk on this port in 3COM.