cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
2314
Views
0
Helpful
6
Replies

getting unknown protocol drops on router gig port which is connecting to trunk port of my LAN switch

khaliquzzama2
Level 1
Level 1

Please help me to get the solution.

below are the router input.

IOS Image bootflash:/isr4300-universalk9.03.13.02.S.154-3.S2-ext.SPA.bi

sh interfaces gigabitEthernet 0/0/1
GigabitEthernet0/0/1 is up, line protocol is up
Hardware is ISR4331-3x1GE, address is ecbd.1d48.8631 (bia ecbd.1d48.8631)
Internet address is 192.168.2.2/30
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 4/255, rxload 2/255
Encapsulation ARPA, loopback not set
Keepalive not supported
Full Duplex, 100Mbps, link type is force-up, media type is RJ45
output flow-control is on, input flow-control is on
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:17, output 00:00:58, output hang never
Last clearing of "show interface" counters 2d04h
Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 1132000 bits/sec, 265 packets/sec
5 minute output rate 1830000 bits/sec, 319 packets/sec
19105808 packets input, 9026244955 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 3818 multicast, 0 pause input
22200372 packets output, 13011087602 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
417 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out

sh ver

Cisco IOS XE Software, Version 03.13.02.S - Extended Support Release

Cisco IOS Software, ISR Software (X86_64_LINUX_IOSD-UNIVERSALK9-M), Version 15.4(3)S2, RELEASE SOFTWARE (fc3)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2015 by Cisco Systems, Inc.

Regards

6 Replies 6

Leo Laohoo
Hall of Fame
Hall of Fame

Is this link an 802.1q Trunk?

It's dot1Q

here is the configuration of switch & router.

Router:


interface GigabitEthernet0/0/0
no ip address
negotiation auto

interface GigabitEthernet0/0/0.20
description Data VLAN connected to switch
encapsulation dot1Q 10 native
ip address 192.168.12.1 255.255.255.0
ip directed-broadcast
ip pim sparse-dense-mode
no cdp enable

Switch:

interface GigabitEthernet1/0/46
description UPLINK TO ROUTER
switchport trunk native vlan 20
switchport mode trunk
speed auto
duplex auto

If the port is an 802.1q Trunk then "Unknown Protocol Drops" are always present.

is there solution to fix it.

It's not an issue to be worried about.  

can I configure switchport nonegotiate on trunk port of switch?

will there be any issue by configuring this.

Review Cisco Networking for a $25 gift card