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Router 887 lost packets

Hello to all.

I cofigured a 887 to connect two distinct networks.

One network (1) with 10 switches.

Other one (network 2) with only one switch 2950-12.

In 887 I confifure two VLAN 1 (for network 1) and VLAN 2 (for network 2).

Network 1 is connected by Fasteternet wireless bridge antenna.

In show interface i have many unknown protocol drops, with a ping test I lost intermitent packets. every for or six ok packets.

After 20/30 seconds I lost connection.

Before this service was release by 1750 (at the moment defunct) without problems with two ether interfaces.

Have any suggestion?

I checked Spanning-tree and root definitions for all vlans ... Only 877 is in iee mode (non support of RSTP).

Thanks in Advance.

Massimo

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