Cisco MDS 9000 Series Troubleshooting Guide

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5-11
Cisco MDS 9000 Family Troubleshooting Guide
OL-5183-02, Cisco MDS SAN-OS Release 1.3
Chapter 5 Troubleshooting IP Storage Issues
Troubleshooting FCIP Connections
6 Attempts for active connections, 3 close of connections
TCP Parameters
Path MTU 1500 bytes
Current retransmission timeout is 100 ms <<< Default, adjusted under
Round trip time: Smoothed 10 ms, Variance: 5
(This is the calculated round trip time of the FCIP tunnel. Large round trip times will require increasing
the TCP window size under the FCIP profile.)
Advertized window: Current: 64 KB, Maximum: 64 KB, Scale: 1
(This is the local advertised TCP window size, and the default is 64 KB.)
Peer receive window: Current: 64 KB, Maximum: 64 KB, Scale: 1
(This is the remote end point advertised TCP window size.)
Congestion window: Current: 2 KB
(This is the minimum windows size used during congestion, and is not configurable.)
5 minutes input rate 136 bits/sec, 17 bytes/sec, 0 frames/sec
5 minutes output rate 136 bits/sec, 17 bytes/sec, 0 frames/sec
2288 frames input, 211504 bytes
2288 Class F frames input, 211504 bytes
0 Class 2/3 frames input, 0 bytes
0 Error frames
2288 frames output, 211520 bytes
2288 Class F frames output, 211520 bytes
0 Class 2/3 frames output, 0 bytes
0 Error frames 0 reass frames
MDS1# show interface fcip 28 brief
-------------------------------------------------------------------------------
Interface Vsan Admin Admin Status Oper Profile Port-channel
Mode Trunk Mode
Mode
-------------------------------------------------------------------------------
fcip28 1 auto on trunking TE 28 --
MDS1# show interface fcip 28 counters bri
-------------------------------------------------------------------------------
Interface Input (rate is 5 min avg) Output (rate is 5 min avg)
----------------------------- -----------------------------
Rate Total Rate Total
Mbits/s Frames Mbits/s Frames
-------------------------------------------------------------------------------
fcip28 18 0 18 0
(This is the frames that averaged over 5 minutes and the total count of frames since the last clear
counters command was issued, or since the last tunnel up.)
Verify default 2 tcp connections are established for each fcip tunnel configured, one for control traffic
and one for data traffic
MDS1# show ips stats tcp interface gigabitethernet 2/8
TCP Statistics for port GigabitEthernet2/8
Connection Stats
6 active openings, 8 accepts
6 failed attempts, 0 reset received, 8 established
Segment stats
295930 received, 1131824 sent, 109 retransmitted
(Excessive retransmits indicate possible core drops and/or that the TCP window size should be adjusted.)
0 bad segments received, 0 reset sent

Cisco MDS 9000 Series Specifications

General

Category	Switch
Operating System	Cisco NX-OS
Ports	Varies by model
Protocols	Fibre Channel (FC), Fibre Channel over IP (FCIP), iSCSI
Redundancy	Redundant supervisors, power supplies, and fans
Management	Cisco Data Center Network Manager (DCNM), CLI, SNMP
Virtualization Support	VSANs (Virtual SANs)
Security Features	Fibre Channel Security Protocol (FC-SP)
Hot Swappable Components	power supplies, fans
Power Supply Options	AC and DC options available