C H A P T E R 5 Troubleshooting Ip Storage Issues; Troubleshooting Ip Connections; Verifying Basic Connectivity; Ol-5183-02, Cisco Mds San-Os Release - Cisco MDS 9000 Series Troubleshooting Manual

Troubleshooting IP Connections

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 .
Troubleshooting IP Connections
If you suspect that all or part of your IP connection has failed, you can verify that by performing one or
more of the procedures in this section. Using these procedures, you can verify connectivity for IP,
subinterfaces/802.1q, EtherChannel, and VRRP for iSCSI.

Verifying Basic Connectivity

Step 1 Perform a basic check of host reachability and network connectivity using the ping command. A sample
output of the ping command follows:
switch# ping 172.18.185.121
PING 172.18.185.121 (172.18.185.121): 56 data bytes
64 bytes from 172.18.185.121: icmp_seq=0 ttl=128 time=0.3 ms
64 bytes from 172.18.185.121: icmp_seq=1 ttl=128 time=0.1 ms
64 bytes from 172.18.185.121: icmp_seq=2 ttl=128 time=0.2 ms
64 bytes from 172.18.185.121: icmp_seq=3 ttl=128 time=0.2 ms
64 bytes from 172.18.185.121: icmp_seq=4 ttl=128 time=0.1 ms
64 bytes from 172.18.185.121: icmp_seq=5 ttl=128 time=0.1 ms
--- 172.18.185.121 ping statistics ---
6 packets transmitted, 6 packets received, 0% packet loss
round-trip min/avg/max = 0.1/0.1/0.3 ms
Verify route to remote device using sh ip route, traceroute, and sh arp commands. A sample output of
Step 2
the sh ip route command follows:
switch # sh ip route
Codes: C - connected, S - static
Default gateway is 172.18.185.97
C 172.18.185.96/27 is directly connected, mgmt0
C 172.18.189.128/26 is directly connected, gigabitethernet4/7
A sample output of the traceroute command follows. The route is using int GigE, verified using the sh
arp command.
switch# traceroute 172.18.185.121
traceroute to 172.18.185.121 (172.18.185.121), 30 hops max, 38 byte packets
1
Another sample output of the traceroute command follows. This route is using int mgmt0, verified using
the sh arp command.
switch# traceroute 10.82.241.17
traceroute to 10.82.241.17 (10.82.241.17), 30 hops max, 38 byte packets
1
2
3
4
5
6
7
Cisco MDS 9000 Family Troubleshooting Guide
5-2
172.18.185.121 (172.18.185.121)
172.18.189.129 (172.18.189.129)
172.18.0.33 (172.18.0.33)
10.81.254.69 (10.81.254.69)
10.81.254.118 (10.81.254.118)
10.83.255.81 (10.83.255.81)
10.83.255.163 (10.83.255.163)
10.82.241.17 (10.82.241.17)
0.411 ms 0.150 ms
0.413 ms 0.257 ms
0.296 ms 0.260 ms 0.258 ms
0.300 ms 0.273 ms 0.277 ms
0.412 ms 0.292 ms
0.320 ms 0.301 ms 0.310 ms
0.314 ms 0.295 ms
48.152 ms 48.608 ms
Chapter 5 Troubleshooting IP Storage Issues
0.146 ms
0.249 ms
0.287 ms
0.279 ms
48.423 ms

OL-5183-02, Cisco MDS SAN-OS Release 1.3