cat 3550-12t and cat 5500

[dong-lee]

Hello,

We connected catalyst 3550-12t and catalyst 5500 using WS-G5484(1000BaseSX Gbic), but we are experiencing packet lost between these two devices.

We don't think it is a mechanical problem since there aren't any CRC or input errors.

Any comments, suggestions or recommandations would really appreciated.

Thank you in advance

Dong

PS.

On 3550-12t switch, speed nonegotiate is on, flowcontrol is off and UDLD is disable.

On 5500 switch, flowcontrol is off.

Thanks again

[sahaya]

Dear Dong-lee,

Can you try to make the trunk between this & try.

regards,

S.P.Raj

[dong-lee]

I made the trunk between these two devices using encapsulation 802.1q but still no improvement.

Thank you

Dong

[Prashanth Krishnappa]

SInce you mention you do not see any port errors on the gig link, how did you determine you are experiencing packet loss? If you can paste the output of show port x/y from the 5500 and sh int gig 0/x from the 3550, it'll help

[dong-lee]

I ran ping(between these two devices) about 1000 times and lost packets averaged about 15 percent.

Cat5500

1-core-switch (enable) sho port 9/8

Port Name Status Vlan Level Duplex Speed Type

----- ------------------ ---------- ---------- ------ ------ ----- ------------

9/8 connected trunk normal full 1000 1000BaseSX

Port Security Violation Shutdown-Time Age-Time Max-Addr Trap IfIndex

----- -------- --------- ------------- -------- -------- -------- -------

9/8 disabled shutdown 0 0 1 disabled 138

Port Num-Addr Secure-Src-Addr Age-Left Last-Src-Addr Shutdown/Time-Left

----- -------- ----------------- -------- ----------------- ------------------

9/8 0 - - - - -

Port Broadcast-Limit Broadcast-Drop

-------- --------------- --------------

9/8 1.00 % -

Port Send FlowControl Receive FlowControl RxPause TxPause Unsupported

admin oper admin oper opcodes

----- -------- -------- -------- -------- ------- ------- -----------

9/8 off off off off 0 0 0

Port Status Channel Admin Ch

Mode Group Id

----- ---------- -------------------- ----- -----

9/8 connected desirable non-silent 103 0

Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize

----- ---------- ---------- ---------- ---------- ---------

9/8 - 0 0 0 0

Port Single-Col Multi-Coll Late-Coll Excess-Col Carri-Sen Runts Giants

----- ---------- ---------- ---------- ---------- --------- --------- ---------

9/8 0 0 0 0 0 0 0

Last-Time-Cleared

--------------------------

Sat Jun 22 2002, 17:01:15

Cat3550

Bswitch#sho int g0/12

GigabitEthernet0/12 is up, line protocol is up

Hardware is Gigabit Ethernet, address is 0009.4428.478c (bia 0009.4428.478c)

MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 1000Mb/s

input flow-control is off, output flow-control is off

ARP type: ARPA, ARP Timeout 04:00:00

Last clearing of "show interface" counters 16:48:44

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 299000 bits/sec, 585 packets/sec

5 minute output rate 1000 bits/sec, 3 packets/sec

32046096 packets input, 2052813840 bytes, 0 no buffer

Received 32039073 broadcasts, 0 runts, 0 giants, 0 throttles

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

0 watchdog, 66943 multicast, 0 pause input

0 input packets with dribble condition detected

45388 packets output, 3650215 bytes, 0 underruns

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

Thank you.

Dong

[dong-lee]

Correction. I ran ping to router(not point to point).

Our router is connected to cat5500 via gigbit uplink(WS-U5534). Cat3550-12t is connect to cat5500 via 9 ports gigbit module(WS-X5410)

Sorry for any confusion.

thanks

[Prashanth Krishnappa]

OK..To eliminate some variables, can you try pinging the sc0 interface of 5500 from the 3550. Also try a different port on the 9 port Gig blade