Cisco Cisco MDS 9000 SAN-OS Software Release 1.0 Guía Para Resolver Problemas

This is the transmit B2B credit transitions from zero under the show interface counters and
aggregate counters command. While this can happen normally, large numbers typically indicate
a problem with the attached device. If the FCP_CNTR_TX_WT_AVG_B2B_ZERO counter was at
zero for 100ms or more, it is incremented.

Commands:

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Explanation:

This counter increments each time an LRR is received. This is typically due to the switch initiating
credit loss recovery. 

Reference:

FCP_CNTR_CREDIT_LOSS

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FCP_CNTR_LINK_RESET_OUT

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IP_FCMAC_INTR_PRIM_RX_SEQ_LRR

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Commands:

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Explanation:

This counter increments each time an LR is transmitted. This is typically caused by the switch
when it initiates credit loss recovery. 

Reference:

FCP_CNTR_CREDIT_LOSS

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FCP_CNTR_LRR_IN

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IP_FCMAC_INTR_PRIM_RX_SEQ_LRR

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Commands:

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The MDS9148 has two central arbiters and 12 port-groups of four ports each. Each arbiter
handles half of the egress port groups. As a packet is received on an ingress port, the Ingress
Credit Buffer (ICB) requests a grant to send a received packet to a specific Destination Index (DI).