[c-nsp] Odd Ethernet Behavior and Interface Counters

[Dennis]

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
> 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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