Is there is any problem with connecting Cisco with 3com?

15 pts.
Tags:
3Com
Cisco
Cisco switches
Switches
Hi, I have 3 com switch and cisco switch and 2 NDs and core switch The connection is like this:
core connect to the 2 NDs

first ND1 connect to cisco switch

second ND2 connect to 3com switch

every switch connect to 2 pcs

(ND1—pc1) (ND2—pc2)

ND1 (vlan1 by default and vlan 172)

nd2 (vlan1 by default and vlan 172)

pc1 connect to vlan 1 (cisco sw)

pc2 connect to vlan 172 (3com sw)
But when I connect the pc1 to vlan 172 (cisco switch) the network with other switch fail (cant see it and it cant connect to any thing) Is there is any problem with connecting cisco with 3com ???

Software/Hardware used:
Software

Answer Wiki

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There should be no problem connecting a Cisco Switch with a 3 Com Swich, are you using any trunking protocol to carry the VLANs information. If not then you should configure it use 802.1q trunking. You can check my article on configuring trunking between Cisco and 3 Com Switch at ITKE.

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