Cisco MDS 9000 Series Troubleshooting Manual page 105

Chapter 5 Troubleshooting IP Storage Issues
S e n d c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m .
TCP Parameters
(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.)
(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
MDS1# show interface fcip 28 brief
-------------------------------------------------------------------------------
Interface
-------------------------------------------------------------------------------
fcip28
MDS1# show interface fcip 28 counters
-------------------------------------------------------------------------------
Interface
-------------------------------------------------------------------------------
fcip28
(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
Segment stats
(Excessive retransmits indicate possible core drops and/or that the TCP window size should be adjusted.)
OL-5183-02, Cisco MDS SAN-OS Release 1.3
6 Attempts for active connections, 3 close of connections
Path MTU 1500 bytes
Current retransmission timeout is 100 ms <<< Default, adjusted under
Round trip time: Smoothed 10 ms, Variance: 5
Advertized window: Current: 64 KB, Maximum: 64 KB, Scale: 1
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
Vsan Admin Admin
Mode Trunk
Mode
1 auto on
Input (rate is 5 min avg)
-----------------------------
Rate Total
Mbits/s Frames
18 0
6 active openings, 8 accepts
6 failed attempts, 0 reset received, 8 established
295930 received, 1131824 sent, 109 retransmitted
0 bad segments received, 0 reset sent
Status Oper Profile
Mode
trunking TE 28
bri
Output (rate is 5 min avg)
-----------------------------
Rate
Mbits/s
18
Cisco MDS 9000 Family Troubleshooting Guide
Troubleshooting FCIP Connections
Port-channel
--
Total
Frames
0
5-11