[c-nsp] Odd Ethernet Behavior and Interface Counters

Wed Feb 22 12:15:39 EST 2006

Hi Dennis:

The Gigabit Interface on the GSR is trunking  I didn¹t include the multiple
sub-interfaces with ³encapsulation dot1q² enabled on a per-VLAN basis.

Thanks,

Mike

On 2/22/06 3:31 AM, "Dennis" <drockz at gmail.com> wrote:

> You have trunking configured on the 3550 but not on the GSR. Configure boths
> sides to match and your issue should clear up.
>  
> Dennis
> 
> 
>  
> On 2/21/06, Michael K. Smith <mksmith at adhost.com> wrote:
>> Hello All:
>> 
>> We have recently installed a GSR with a 3-port GigE line card.  Only one of
>> the ports is in use and it connects to a Catalyst 3550 in layer-2 mode.  We
>> are seeing two issues that may be completely unrelated, but we're at a loss
>> to tell.  Any help or insights would be greatly appreciated.
>> 
>> The issues are, 1) connectivity issues to some subnets but not others and,
>> 2) lots of Giants on the interface on the GSR side.  The second issue is odd
>> because there is no device anywhere in the network sending frames larger
>> than 1500 bytes and the system mtu is set to 1500 on the 3550.  As you can
>> imagine, there are no errors on the 3550-side.  As for the multicast, I can
>> only assume that's HSRP working as there are quite a few sub-interfaces on
>> the GSR Gig port for HSRP groups.
>> 
>> Here is what a traceroute looks like from the GSR to a device connected off
>> a switch connected ultimately to the 3550.
>> 
>> Tracing the route to xxx
>> 
>> 1  ?  ?  ?
>> 2  ?  ?  ?
>> 3  *  ?  ?
>> 4  ?  *
>> 
>> Pings get through with no trouble.
>> 
>> The second issue is the counters on the GigE port on the GSR.  I've included
>> config snippets and "sho int" from both sides of the connection.
>> 
>> GSR:
>> 
>> interface GigabitEthernet0/0
>> description Uplink
>> ip address x.x.x.x 255.255.255.248 <http://255.255.255.248>
>> no ip directed-broadcast
>> no negotiation auto
>> 
>> GigabitEthernet0/0 is up, line protocol is up
>> Hardware is GigMac 3 Port GigabitEthernet, address is 0003.a01b.4000 (bia
>> 0003.a01b.4000)
>> Description: Uplink ot sea-csw0/s0/p1
>> Internet address is x.x.x.x/29
>> MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec, rely 255/255, load 13/255
>> Encapsulation ARPA, loopback not set
>> Keepalive set (10 sec)
>> Full Duplex, 1000Mbps, link type is force-up, media type is SX
>> 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 02:03:26
>> Queueing strategy: fifo
>> Output queue 0/40, 0 drops; input queue 0/75, 0 drops
>> 5 minute input rate 161389000 bits/sec, 20416 packets/sec
>> 5 minute output rate 51105000 bits/sec, 16578 packets/sec
>>     153982848 packets input, 148831716397 bytes, 0 no buffer
>>     Received 81408 broadcasts, 0 runts, 19969765 giants, 0 throttles
>>     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
>>     0 watchdog, 1654495 multicast, 0 pause input
>>     122125511 packets output, 36787730021 bytes, 0 underruns
>>     Transmitted 10763 broadcasts
>>     0 output errors, 0 collisions, 0 interface resets
>>     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
>> 
>> On the 3550
>> 
>> interface GigabitEthernet0/1
>> description Uplink
>> switchport trunk encapsulation dot1q
>> switchport trunk native vlan 17
>> switchport mode trunk
>> switchport nonegotiate
>> speed nonegotiate
>> 
>> GigabitEthernet0/1 is up, line protocol is up (connected)
>> Hardware is Gigabit Ethernet, address is 000a.f472.a801 (bia
>> 000a.f472.a801)
>> Description: Uplink to sea-cor0/s0/p0
>> MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
>>     reliability 255/255, txload 41/255, rxload 13/255
>> Encapsulation ARPA, loopback not set
>> Keepalive set (10 sec)
>> Full-duplex, 1000Mb/s, media type is SX
>> input flow-control is off, output flow-control is off
>> ARP type: ARPA, ARP Timeout 04:00:00
>> Last input 00:00:13, 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)
>> 5 minute input rate 53164000 bits/sec, 16734 packets/sec
>> 5 minute output rate 163741000 bits/sec, 20673 packets/sec
>>     1414965791 packets input, 76037141 bytes, 0 no buffer
>>     Received 6175071 broadcasts (0 multicast)
>>     0 runts, 0 giants, 0 throttles
>>     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
>>     0 watchdog, 6016213 multicast, 0 pause input
>>     0 input packets with dribble condition detected
>>     2546834074 packets output, 2574303238 bytes, 0 underruns
>>     0 output errors, 0 collisions, 3 interface resets
>>     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
>> 
>> 
>> 
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> 