Conference irocz::common_brouters

900.0. "Drop counter of VNswitch900EA" by TKOV51::HAYAKAWA (Kouhei Hayakawa, NPB/MS, Osaka HUB6F) Wed May 14 1997 00:10

I would like to know what do the following counters of VNswitch900EA mean.

"Dropped, source address filtering"
"Dropped, dest address filtering"
"Dropped, source or dest port blocked"

Our customer uses GIGAswitch/ATMs, VNswitch900EAs and AlphaServers with 
ATMwork350. They use LAN Emulation and the ATM network works fine. 
But some packets via VNswitch900EA are lost every day. 
I think the counters of VNswitch900EA are related to packets lost.

The following is the port counter of VNswitch900EA.

BRIDGE>list count port 15
Counters for port 15, interface Eth/13:
Port restarts:                                    1
Total frames received by interface:         1367374
IP frames fragmented:                             0
IP frames not fragmented:                         0
Frames submitted to bridging:               1291581
Frames with unknown dest address:              4659
Frames causing learning transactions:         23546
Dropped, source address filtering:               74
Dropped, dest address filtering:               2734
Dropped, protocol filtering:                      0
Dropped, address rate limiting:                   0
Dropped, protocol rate limiting:                  0
Dropped, input queue overflow:                    0
Dropped, source or dest port blocked:           155
Dropped, terminating queue overflow:              0
Dropped, fragmentation queue overflow:            0
Dropped, translate flood queue overflow:          0
Dropped, translation failure:                     0

Kohei

"Dropped, source address filtering"
    The Source Address caused the packet to be filtered.
    Either an SA filter was configured or
        a packet with that SA was received during the
        exact period when the SA was being learned.
        During this period forwarding the packet may
        cause an out of order packet to be received.
        If the protocol type is not known to tolerate the out
        of order packets, the packet is dropped.
    Also, Source Addresses that are multicast addresses are
        always filtered.
"Dropped, dest address filtering"
    The Destination Address caused the packet to be filtered.
    Either a DA filter was configured or a packet was filtered
        during a learning transition.
"Dropped, source or dest port blocked"
    Either the source or destination port was not in forwarding state.
    This happens when a port is "coming up" and during any spanning 
    tree re-configuration.
    
    Hugh

    

Thank you very much for your quick response.

We don't configure any filtering on VNswitch900EA. 
So I think that the reason why some packets are lost is related to the 
behavier of LAN Emulation Client. When the VNswitch900EA receives a packet and
if the VNswitch900EA doesn't have the LE-ARP entry, may the packet be lost 
till LE-ARP operation is completed ?

Kohei

    yes, until the LE-ARP completes, packets may drop due to rate limiting.
    In addition, the BUS may drop packets.
    
    Hugh
    

	Thank you very much.

Kohei