Network Setup
Firstly, there was no problem with NX-OS 4.2(1)N2(1):
n5010-sw1# sh ver Cisco Nexus Operating System (NX-OS) Software TAC support: http://www.cisco.com/tac Copyright (c) 2002-2010, Cisco Systems, Inc. All rights reserved. The copyrights to certain works contained herein are owned by other third parties and are used and distributed under license. Some parts of this software are covered under the GNU Public License. A copy of the license is available at http://www.gnu.org/licenses/gpl.html. Software BIOS: version 1.3.0 loader: version N/A kickstart: version 4.2(1)N2(1) system: version 4.2(1)N2(1) power-seq: version v1.2 BIOS compile time: 09/08/09 kickstart image file is: bootflash:/n5000-uk9-kickstart.4.2.1.N2.1.bin kickstart compile time: 7/28/2010 18:00:00 [07/29/2010 01:10:19] system image file is: bootflash:/n5000-uk9.4.2.1.N2.1.bin system compile time: 7/28/2010 18:00:00 [07/29/2010 05:18:12] Hardware cisco Nexus5010 Chassis ("20x10GE/Supervisor") Intel(R) Celeron(R) M CPU with 2074284 kB of memory. Processor Board ID JAF1429ERMA Device name: n5010-sw1 bootflash: 1003520 kB Kernel uptime is 51 day(s), 4 hour(s), 45 minute(s), 38 second(s) Last reset at 125383 usecs after Thu Oct 7 07:25:30 2010 Reason: Reset Requested by CLI command reload System version: 4.2(1)N2(1) Service: plugin Core Plugin, Ethernet Plugin, Fc Plugin n5010-sw1# n5010-sw1# ping 192.168.1.2 PING 192.168.1.2 (192.168.1.2): 56 data bytes 64 bytes from 192.168.1.2: icmp_seq=0 ttl=254 time=2.281 ms 64 bytes from 192.168.1.2: icmp_seq=1 ttl=254 time=1.11 ms 64 bytes from 192.168.1.2: icmp_seq=2 ttl=254 time=1.006 ms 64 bytes from 192.168.1.2: icmp_seq=3 ttl=254 time=1.018 ms 64 bytes from 192.168.1.2: icmp_seq=4 ttl=254 time=1.019 ms --- 192.168.1.2 ping statistics --- 5 packets transmitted, 5 packets received, 0.00% packet loss round-trip min/avg/max = 1.006/1.286/2.281 ms n5010-sw1# n5010-sw1# ping 192.168.1.2 packet-size 1472 PING 192.168.1.2 (192.168.1.2): 1472 data bytes 1480 bytes from 192.168.1.2: icmp_seq=0 ttl=254 time=1.741 ms 1480 bytes from 192.168.1.2: icmp_seq=1 ttl=254 time=1.124 ms 1480 bytes from 192.168.1.2: icmp_seq=2 ttl=254 time=1.1 ms 1480 bytes from 192.168.1.2: icmp_seq=3 ttl=254 time=1.058 ms 1480 bytes from 192.168.1.2: icmp_seq=4 ttl=254 time=1.192 ms --- 192.168.1.2 ping statistics --- 5 packets transmitted, 5 packets received, 0.00% packet loss round-trip min/avg/max = 1.058/1.243/1.741 ms n5010-sw1# n5010-sw1# ping 192.168.1.2 packet-size 1473 PING 192.168.1.2 (192.168.1.2): 1473 data bytes 1481 bytes from 192.168.1.2: icmp_seq=0 ttl=254 time=1.32 ms 1481 bytes from 192.168.1.2: icmp_seq=1 ttl=254 time=0.907 ms 1481 bytes from 192.168.1.2: icmp_seq=2 ttl=254 time=0.9 ms 1481 bytes from 192.168.1.2: icmp_seq=3 ttl=254 time=1.052 ms 1481 bytes from 192.168.1.2: icmp_seq=4 ttl=254 time=3.502 ms --- 192.168.1.2 ping statistics --- 5 packets transmitted, 5 packets received, 0.00% packet loss round-trip min/avg/max = 0.9/1.536/3.502 ms n5010-sw1# n5010-sw1# ping 192.168.1.2 packet-size 3000 PING 192.168.1.2 (192.168.1.2): 3000 data bytes 3008 bytes from 192.168.1.2: icmp_seq=0 ttl=254 time=2.031 ms 3008 bytes from 192.168.1.2: icmp_seq=1 ttl=254 time=1.474 ms 3008 bytes from 192.168.1.2: icmp_seq=2 ttl=254 time=1.388 ms 3008 bytes from 192.168.1.2: icmp_seq=3 ttl=254 time=1.397 ms 3008 bytes from 192.168.1.2: icmp_seq=4 ttl=254 time=1.473 ms --- 192.168.1.2 ping statistics --- 5 packets transmitted, 5 packets received, 0.00% packet loss round-trip min/avg/max = 1.388/1.552/2.031 ms n5010-sw1#
Below shows the problem scenario observed on NX-OS 5.0(2)N1(1):
n5010-sw1# sh ver Cisco Nexus Operating System (NX-OS) Software TAC support: http://www.cisco.com/tac Copyright (c) 2002-2010, Cisco Systems, Inc. All rights reserved. The copyrights to certain works contained herein are owned by other third parties and are used and distributed under license. Some parts of this software are covered under the GNU Public License. A copy of the license is available at http://www.gnu.org/licenses/gpl.html. Software BIOS: version 1.3.0 loader: version N/A kickstart: version 5.0(2)N1(1) system: version 5.0(2)N1(1) power-seq: version v1.2 BIOS compile time: 09/08/09 kickstart image file is: bootflash:/n5000-uk9-kickstart.5.0.2.N1.1.bin kickstart compile time: 10/15/2010 0:00:00 [10/15/2010 08:00:43] system image file is: bootflash:/n5000-uk9.5.0.2.N1.1.bin system compile time: 10/15/2010 0:00:00 [10/15/2010 09:34:05] Hardware cisco Nexus5010 Chassis ("20x10GE/Supervisor") Intel(R) Celeron(R) M CPU with 2074284 kB of memory. Processor Board ID JAF1429ERMA Device name: n5010-sw1 bootflash: 1003520 kB Kernel uptime is 0 day(s), 23 hour(s), 19 minute(s), 23 second(s) Last reset at 296097 usecs after Fri Nov 26 12:43:08 2010 Reason: Disruptive upgrade System version: 4.2(1)N2(1) Service: plugin Core Plugin, Ethernet Plugin, Fc Plugin n5010-sw1# n5010-sw1# ping 192.168.1.2 PING 192.168.1.2 (192.168.1.2): 56 data bytes 64 bytes from 192.168.1.2: icmp_seq=0 ttl=254 time=7.09 ms 64 bytes from 192.168.1.2: icmp_seq=1 ttl=254 time=1.216 ms 64 bytes from 192.168.1.2: icmp_seq=2 ttl=254 time=1.223 ms 64 bytes from 192.168.1.2: icmp_seq=3 ttl=254 time=1.196 ms 64 bytes from 192.168.1.2: icmp_seq=4 ttl=254 time=1.142 ms --- 192.168.1.2 ping statistics --- 5 packets transmitted, 5 packets received, 0.00% packet loss round-trip min/avg/max = 1.142/2.373/7.09 ms n5010-sw1# n5010-sw1# ping 192.168.1.2 packet-size 1472 PING 192.168.1.2 (192.168.1.2): 1472 data bytes 1480 bytes from 192.168.1.2: icmp_seq=0 ttl=254 time=1.884 ms 1480 bytes from 192.168.1.2: icmp_seq=1 ttl=254 time=1.059 ms 1480 bytes from 192.168.1.2: icmp_seq=2 ttl=254 time=1.383 ms 1480 bytes from 192.168.1.2: icmp_seq=3 ttl=254 time=0.985 ms 1480 bytes from 192.168.1.2: icmp_seq=4 ttl=254 time=1.36 ms --- 192.168.1.2 ping statistics --- 5 packets transmitted, 5 packets received, 0.00% packet loss round-trip min/avg/max = 0.985/1.334/1.884 ms n5010-sw1# n5010-sw1# ping 192.168.1.2 packet-size 1473 PING 192.168.1.2 (192.168.1.2): 1473 data bytes Request 0 timed out Request 1 timed out Request 2 timed out Request 3 timed out Request 4 timed out --- 192.168.1.2 ping statistics --- 5 packets transmitted, 0 packets received, 100.00% packet loss n5010-sw1# n5010-sw1# ping 192.168.1.2 packet-size 1500 PING 192.168.1.2 (192.168.1.2): 1500 data bytes Request 0 timed out Request 1 timed out Request 2 timed out Request 3 timed out Request 4 timed out --- 192.168.1.2 ping statistics --- 5 packets transmitted, 0 packets received, 100.00% packet loss n5010-sw1#
Note: This problem has nothing to do with the Jumbo Frame configuration, as the ICMP Echo Request packets are sent without the DF (Don't Fragment) bit set, and therefore we are expecting fragmentation to occur.
Lastly, the Cisco TAC engineer filed a new bug for this. :-)
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