Cisco MDS 9000 Series Troubleshooting Manual page 50

Troubleshooting E Port Connectivity - ISL Isolation
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 .
Received 0 runts, 0 jabber, 0 too long, 0 too short
133283352 packets output, 1332969530 bytes
Transmitted 198 OLS, 50 LRR, 0 NOS, 10 loop inits
In this example the interface is indicating a link isolation caused by an ELP failure on an E port. The
ELP is a frame sent between two switches to negotiate fabric parameters. If you get this failure, verify
the fabric parameters are the same for both switches.
Since fabric parameters are configured on a per switch basis, however, they are required to be the same
for all switches within a fabric.
If the interface indicates an ELP failure verify the following parameters match using the show fctimer
command:
ED_TOV Timer
•
RA_TOV Timer
•
• FS_TOV timer
An example of the show fctimer command where all default value are in use, is shown below
switch# show fctimer
F_S_TOV : 5000 milliseconds
D_S_TOV : 15000 milliseconds
E_D_TOV : 2000 milliseconds
R_A_TOV : 10000 milliseconds
Another parameter to check, is the Rcxbuffer size on the interface. This value should match on both the
ends of a ISL. To verify the value of the Rcxbuffer size, use the following command:
switch# show port internal info interface fc2/1
fc2/1 - if_index:
Admin Config - state(up), mode(Auto), speed(auto), trunk(no trunk)
beacon(off), snmp trap(on), tem(false)
bb_credit(default), rxbufsize(2112), encap(default)
description()
Operational Info - state(down), mode(ALL), speed(auto), trunk(no trunk)
state reason(Link failure or not-connected)
phy port enable (1), phy layer (FC)
participating(1), port_vsan(1), null_vsan(0), fcid(0x000000)
current state [PI_FSM_ST_LINK_INIT]
port_init_eval_flag(0x00000001), cfg wait for none
Mts node id 0x202
cnt_link_failure(0), cnt_link_success(0), cnt_port_up(0)
cnt_cfg_wait_timeout(0), cnt_port_cfg_failure(0), cnt_init_retry(0)
Port Capabilities -
Modes: E,TE,F,FL,TL,SD
Min Speed: 1000
Max Speed: 2000
Max Tx Bytes: 2112
Max Rx Bytes: 2112
Max Tx Buffer Credit: 255
Max Rx Buffer Credit: 16
Max Private Devices: 63
Max Sourcable Pkt Size: 2112
Hw Capabilities: 0xb
Connector Type: 0x0
Cisco MDS 9000 Family Troubleshooting Guide
3-4
0 EOF abort, 0 fragmented, 0 unknown class
100 OLS, 67 LRR, 37 NOS, 0 loop inits
1080000
Chapter 3 Troubleshooting Switch Level Issues and Interswitch Connectivity
OL-5183-02, Cisco MDS SAN-OS Release 1.3