Forwarding Engines - Cisco MDS 9000 Series Configuration Manual

Configuring and Managing Zones
4
fc1/2 - Target1 interface
Entry#
1
2
fc1/3 - Target2 interface
Entry#
1
2
fc1/4 - Target3 interface
Entry#
1
2
Note that in the above example, the target-to-target entries are not found, and that six of the 12 entries are no
longer programmed. This results in lesser use of TCAM and better security (only the host can communicate
with the three targets, and the targets themselves can communicate only with one host, and not with each
other).

Forwarding Engines

TCAM is allocated to individual forwarding engines and forwarding engines are assigned a group of ports.
Director-class Fibre Channel modules have more TCAM space than fabric switches. The number of forwarding
engines, the ports assigned to each forwarding engine, and the amount of TCAM allocated to each forwarding
engine is hardware dependent.
The following example shows an output from Cisco MDS 9148S:
RTP–SAN–15–10–9148s–1# show system internal acltcam–soc tcam–usage
TCAM Entries:
=============
Mod Fwd
––– –––
1
1
1
1
1
1
–––––––––––––––––––––––––––––––––––––––––––––––––––
* 1024 entries are reserved for LUN Zoning purpose.
The above example indicates the following:
• There are three forwarding engines, 1 through 3.
• Since there are 48 ports on Cisco MDS 9148 switches, each forwarding engine handles 16 ports.
• Each forwarding engine has 2852 entries in region 3 (the zoning region) for input. This is the main region
• Forwarding engine 3 has only one entry that is currently in use out of the total 2852 in the zoning region.
The following example shows the output from Cisco MDS 9710 switch with a 2/4/8/10/16 Gbps Advanced
Fibre Channel Module (DS–X9448–768K9):
F241–15–09–9710–2# show system internal acl tcam–usage
000000 000000
Source ID Mask
010002 ffffff
000000 000000
Source ID Mask
010003 ffffff
000000 000000
Source ID Mask
010004 ffffff
000000 000000
Region1
Dir TOP SYS SECURITY
Eng Use/Total Use/Total
–––––– –––––––––– ––––––––– –––––––––––– ––––––––– ––––––––– –––––––––
1 INPUT 19/407
1 OUTPUT 0/25
2 INPUT 19/407
2 OUTPUT 0/25
3 INPUT 19/407
3 OUTPUT 0/25
used, and consequently, has the largest amount of available entries.
000000
Destination ID
010001(host)
000000
Destination ID
010001(host)
000000
Destination ID
010001(host)
000000
Region2 Region3 Region4
ZONING BOTTOM
Use/Total Use/Total Use/Total Use/Total
1/407 1/2852 *
0/25 0/140
1/407 0/2852 *
0/25 0/140
1/407 0/2852 *
0/25 0/140
Cisco MDS 9000 Series Fabric Configuration Guide, Release 8.x
Forwarding Engines
000000 Drop
Mask Action
ffffff Permit
000000 Drop
Mask Action
ffffff Permit
000000 Drop
Mask Action
ffffff Permit
000000 Drop
Region5 Region6
FCC DIS FCC ENA
4/407 0/0 0/0
0/25 0/12 1/25
4/407 0/0 0/0
0/25 0/12 1/25
4/407 0/0 0/0
0/25 0/12 1/25
141