Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

Dropped packets on Vlan interface

Hello, we've recently been experiencing issues with connectivity to one of our service providers. The network is on a vlan switch trunked into a Pix 515.

Personally I don't think that the dropped packets are the cause of the problem - but I just want to know is it normal to have these drops? Also they are incrementing as I had cleared the counters today - please see below:

TIA

Interface Ethernet2.54 "bny", is up, line protocol is up

VLAN identifier 54

Description: ***BNY SP LINK***

MAC address 000d.8810.7010, MTU 1500

IP address 192.168.0.1, subnet mask 255.255.255.0

Received 39783 packets, 13724740 bytes

Transmitted 29182 packets, 10437172 bytes

Dropped 257 packets

2 REPLIES
Cisco Employee

Re: Dropped packets on Vlan interface

these drops are normal. may be you have the trunk not set correctly. may be you are sending vlan packets that pix is not configured for.

thanks

Nadeem

New Member

Re: Dropped packets on Vlan interface

Hello Nadeem - this is the response after 1 day - the drops are a great percentage of the overall traffic - see below - I've also posted the partial configs of both switch and firewall -thanks

------------here's the physical interface stats:

Interface Ethernet2 "", is up, line protocol is up

Hardware is i82559, BW 100 Mbps

Auto-Duplex(Full-duplex), Auto-Speed(100 Mbps)

Description: ***PHYSICAL LINK TO EXTRANET VLAN SWITCH***

Available but not configured via nameif

MAC address 000d.8810.7010, MTU not set

IP address unassigned

3985926 packets input, 1071610479 bytes, 0 no buffer

Received 52304 broadcasts, 0 runts, 0 giants

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

2470303 packets output, 347691667 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 babbles, 0 late collisions, 0 deferred

0 lost carrier, 0 no carrier

input queue (curr/max blocks): hardware (128/128) software (0/67)

output queue (curr/max blocks): hardware (0/24) software (0/1)

---------------now here's the problematic interface:

Interface Ethernet2.54 "bny", is up, line protocol is up

VLAN identifier 54

Description: ***BNY SP LINK***

MAC address 000d.8810.7010, MTU 1500

IP address 192.168.0.1, subnet mask 255.255.255.0

Received 800563 packets, 361416438 bytes

Transmitted 690914 packets, 49565490 bytes

Dropped 535499 packets

112
Views
0
Helpful
2
Replies