Cisco MDS 9000 Series Configuration Manual page 170

E and TE Port Channels and IVR
- Rewrite the following information:
MDS9148S-2
Entry#
1
- Forward to fc1/2
- Rewrite the following information:
2
Note
Besides the entries in this example, there are other entries that IVR adds to capture important frames such as
PLOGIs, PRILIs, and ABTS.
The programming on the host and target1 ports is similar to the way it is without IVR, except that the FCIDs
and VSANs are explicitly forwarded to an egress port and are rewritten to values that are appropriate for the
transit VSAN (VSAN 2). These forwarding and rewrite entries are separate and are not included in the
TCAM-usage values.
However, now, on the ISLs in both the switches, programming that did not exist earlier is present. When
frames from Host to Target1 are received by Cisco MDS 9148S-2 fc1/2, they are rewritten to the values in
VSAN 3 where the target resides. In the reverse direction, when frames from Target1 to the Host are received
by Cisco MDS 9148S-1 fc1/2, they are rewritten to the values in VSAN 1 where the Host resides. Thus, for
each VSAN transition on an ISL (that typically occurs across a transit VSAN) there will be TCAM programming
for each device in the IVR zone set.
Consequently, most of the best practices followed for the F and TF port channels should be followed to ensure
that TCAM is utilized as efficiently as possible for the following purposes:
Note
Unlike F and TF port-channels, the ACLTCAM programming on ISLs will be the same quantity regardless
if the ISLs are part of a port-channel or not. If there are "n" ISLs between two MDS switches, then it doesn't
matter if they are in one port-channel, two port-channels or just individual links. The ACLTCAM programming
will be the same.
• Distribute port-channel member interfaces into different forwarding engines, especially on fabric switches.
• Distribute member interfaces into different linecards on director-class switches.
• Distribute member interfaces into forwarding engines with lower TCAM zoning region usage.
• Use single-initiator zones, single-target zones, or Smart Zoning.
Cisco MDS 9000 Series Fabric Configuration Guide, Release 8.x
148
VSAN to 3
Source ID to 550002
Destination ID to 030001
fc1/1(Target1) - VSAN 3
Source ID Mask
030001(Target1) ffffff
VSAN to 2
Source ID to 360002
Destination ID to 210001
000000 000000
Destination ID
550002(host)
000000
Configuring and Managing Zones
Mask Action
ffffff Permit
000000 Drop