networking-forum.com
Community BlogCommunity Wiki * Register  * Search  * Login
View unanswered postsView active topics

All times are UTC - 6 hours [ DST ]



Post new topic Reply to topic  [ 4 posts ] 
Author Message
 Post subject: Unknown Protocol Dropps
PostPosted: Tue Jul 31, 2012 11:22 am 
Offline
New Member
New Member

Joined: Tue Jul 10, 2012 12:57 pm
Posts: 10
Hello Everyone,

I have coome accross a few sites that I see some unknown protocol drops on the internal interface connecting to the switch.

Code:
GigabitEthernet0/0 is up, line protocol is up
  Hardware is PQ3_TSEC, address is e05f.b951.6120 (bia e05f.b951.6120)
  Description: Data_LAN
  MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
     reliability 255/255, txload 20/255, rxload 20/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 100Mb/s, media type is unknown media type
  output flow-control is unsupported, input flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  30 second input rate 8227000 bits/sec, 1618 packets/sec
  30 second output rate 8167000 bits/sec, 1539 packets/sec
     50774358 packets input, 23435727373 bytes, 0 no buffer
     Received 2398390 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 138209 multicast, 0 pause input
     0 input packets with dribble condition detected
     48875310 packets output, 37006767664 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     2112 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     1 lost carrier, 0 no carrier, 0 pause output
     0 output buffer failures, 0 output buffers swapped out


I did some research on this.. some say it is a bug in the code. I checked cisco and they came up with nothing for this perticular issue. I have also read something about cdp causing this issue, but cdp is enabled on both interfaces (router and switch)

has anyone else had any problems/fixes for this issue?
Thankls


Top
 Profile  
 
PostPosted: Tue Jul 31, 2012 11:42 am 
Offline
Post Whore
Post Whore
User avatar

Joined: Mon Jan 17, 2005 11:01 pm
Posts: 5148
Location: Canada eh
Certs: 350-001, CCNP, CXFF, ITILv3F
Why do you think this is an issue? It's like 0.0004% of your traffic...

It's likely exactly what it says it is. Unknown protocol packets. You got anything talking IPX?

_________________
blog.brokennetwork.ca


Top
 Profile  
 
PostPosted: Tue Jul 31, 2012 12:39 pm 
Offline
Senior Member
Senior Member

Joined: Sat Oct 11, 2008 1:02 pm
Posts: 366
Location: Riga, Latvia
Certs: CCIP
These can be anything.
If u do not have STP running, BPDU's will be classified as unknown protocol drops. Same goes for CDP, VTP, DTP packets.


Top
 Profile  
 
PostPosted: Tue Jul 31, 2012 4:27 pm 
Offline
Ultimate Member
Ultimate Member
User avatar

Joined: Thu Jan 13, 2011 5:10 pm
Posts: 984
Location: Leeds, UK
Certs: CCIE R&S #38338, CCNP, CCIP
Yeah, we had the same on some of the interfaces on our ASR9K's and at first we were a little worried until we found out that any none-IP packet that the device receives that it doesn't understand it will be classed as unknown and dropped.

As others have said this could be DTP/VTP etc when on a router platform.

_________________
---
David
CCIE R&S #38338, CCIP, CCNP

http://networkbroadcast.co.uk - My Blog
http://twitter.com/davidrothera


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 4 posts ] 

All times are UTC - 6 hours [ DST ]


Who is online

Users browsing this forum: condor, FaceBook [Linkcheck], Google Feedfetcher, srg, timaz, williamtyrell78 and 25 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group