I am talking about MDS9124 BB_Credit Buffers when setting up an ISL between 2 MDS9124.
The document you refer tells that MDS9124 can have up to 61 BB_Credits Buffers in E mode (ISL), but I could not configure 61 BB_Credits on ISL port. It only accepts 16 BB_Credits. And the doc in Table15-16 says it is possible to configure 61 BB_Credits for an ISL (default is 16).
And the same document for NX-OS 5.x only talk about 16 BB_Credit Buffer.
The reason is that I am using an ISL on a long distance and I need more than 16 BB_Credits between both MDS9124.
Extended BB_credits : allow for a very long haul Fibre connections between two MDS switches.
MDS9134(config-if)# switchport fcrxbbcredit ?
<1-750> Enter receive BB_credit
default Default receive BB_credit
performance-buffers Configure performance buffers for receive BB_credit
MDS9134(config-if)# switchport fcrxbbcredit
For Extended BB_Credits Doc states:
Note Extended BB_credits are not supported on the Cisco MDS 9124 Fabric Switch, Cisco MDS 9134 Fabric Switch,the Cisco Fabric Switch for HP c-Class BladeSystem, and the Cisco Fabric Switch for IBM BladeCenter.
To facilitate BB_credits for long haul links, the extended BB_credits feature allows the user to configure the receive buffers above the maximum value on all Generation 2 and Generation 3 switching modules (see the "Buffer Credit Allocation" section). When necessary, you can reduce the buffers on one port and assign them to another port, exceeding the default maximum. The minimum extended BB_credits per port is 256 and the maximum is 4095.
In general, the user can configure any port in a port group to dedicated rate mode. To do this, you must first release the buffers from the other ports before configuring larger extended BB_credits for a port.
Note The ENTERPRISE_PKG license is required to use extended BB_credits on Generation 2 and Generation 3 switching modules. Also, extended BB_credits are not supported by ports in shared rate mode.
All ports on the Generation 2 and Generation 3 switching modules support extended BB_credits. There are no limitations for how many extended BB_credits you can assign to a port (except for the maximum and minimum limits). If necessary, you can take interfaces out of service to make more extended BB_credits available to other ports.
There is another type of buffers called Performance Buffers. that can improve switchport performance. Each MDS switchport supports upto 145 performance buffers, If normal BB_credits are exhauseted.
I have to disabled (out-of-service) the other 3 ports from the same port-group to be able to configure 61 BB_Credit for 1 port. This way I could get 61 BB_Credits from the 64 BB_Credit pool allocated to the port-group.
Extended and Performance buffer are not available for MDS9124.
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