Cisco Cisco MDS 9000 SAN-OS Software Release 1.0 Guía Para Resolver Problemas
The ICB sends a grant request to arbiter 0 for port-groups 0-5 and to arbiter 1 for port-groups 6-
11. If there is space in the transmit buffers of the DI, the arbiter returns a grant to the requesting
ingress port, and the frame can be transmitted.
11. If there is space in the transmit buffers of the DI, the arbiter returns a grant to the requesting
ingress port, and the frame can be transmitted.
Arbiter requests and grants can be seen in this command-line interface (CLI) example:
MDS9148# slot 1 show hardware internal icb 0 statistics | i ARB
0x00000d14 PG0_ICB_ARB0_REQ_CNT 0xf8e
0x00000d18 PG0_ICB_ARB1_REQ_CNT 0x2e93
0x00000d1c PG0_ICB_ARB0_GNT_CNT 0xf8e
0x00000d20 PG0_ICB_ARB1_GNT_CNT 0x2e93
0x00000d14 PG1_ICB_ARB0_REQ_CNT 0x3e1c
0x00000d1c PG1_ICB_ARB0_GNT_CNT 0x3e1c
...snip
0x00000d14 PG10_ICB_ARB0_REQ_CNT 0x3e1c
0x00000d1c PG10_ICB_ARB0_GNT_CNT 0x3e1c
0x00000d14 PG11_ICB_ARB0_REQ_CNT 0x3e1c
0x00000d1c
PG11_ICB_ARB0_GNT_CNT 0x3e1c
MDS 9148 Commands for Queued Packets
The MDS (Sabre) has specific commands in order to check for queued packets. These commands
are similar to, but not nearly as useful as, the show hardware internal up-xbar 0 queued-
packet-info command that is available in the Cisco MDS 9500 Series Multilayer Directors.
are similar to, but not nearly as useful as, the show hardware internal up-xbar 0 queued-
packet-info command that is available in the Cisco MDS 9500 Series Multilayer Directors.
If the configured credits are less than than the available credits, there are frames pending for that
device interface (DI). In this example, fc1/13 is sending to the slow drain device that is connected
on fc1/25. fc1/25 shows two packets queued:
device interface (DI). In this example, fc1/13 is sending to the slow drain device that is connected
on fc1/25. fc1/25 shows two packets queued:
module-1# show hardware internal arb 0 cell-frame-credits
CCC = Cell Credits Configured.
CCA = Cell Credits Available - Live from hardware.
FCC = Frame Credits Configured.
FCA = Frame Credits Available- Live from hardware.
STA = Cell/Frame Credit status reported by hardware.
+----+---+----+-------------------------+--------------------------+
| | |Port| PRIORITY 0 | PRIORITY 1 |
|Port| DI|Mode| CCC|CCA|STA| FCC|FCA|STA| CCC|CCA|STA| FCC|FCA|STA|
+----+---+----+----+---+---+----+---+---+-----+---+---+----+---+---+
| 1| 35| E| 36| 36| Y| 36| 36| Y| 36| 36| Y| 36| 36| Y|
+----+---+----+----+---+---+----+---+---+-----+---+---+----+---+---+
| 2| 34| E| 36| 36| Y| 36| 36| Y| 36| 36| Y| 36| 36| Y|
+----+---+----+----+---+---+----+---+---+-----+---+---+----+---+---+
...
+----+---+----+----+---+---+----+---+---+-----+---+---+----+---+---+
| 13| 44| E| 36| 36| Y| 36| 36| Y| 36| 36| Y| 36| 36| Y|
+----+---+----+----+---+---+----+---+---+-----+---+---+----+---+---+
...
+----+---+----+----+---+---+----+---+---+-----+---+---+----+---+---+
| 25| 10| E| 36| 34| Y| 36| 35| Y| 36| 2| Y| 36| 34| Y|
<< 36 - 34 = 2 packets
queued
+----+---+----+----+---+---+----+---+---+-----+---+---+----+---+---+ << 36 - 2 = 34 packets
queued
| 26| 11| E| 36| 36| Y| 36| 36| Y| 36| 36| Y| 36| 36| Y|
+----+---+----+----+---+---+----+---+---+-----+---+---+----+---+---+
...
Packet headers for packets currently queued can be viewed with the slot 1 show hardware
internal icb 0 port-grp 3 pkt-hdr 0 linecard command. Each port-group comprises four ports, so
the proper port-group of the ingress port must be chosen. The packet header is displayed in real
internal icb 0 port-grp 3 pkt-hdr 0 linecard command. Each port-group comprises four ports, so
the proper port-group of the ingress port must be chosen. The packet header is displayed in real