Cisco WS-X6066-SLB-APC - Content Switching Module Software Manual page 790

Configuring ASLB
MSFC and Multilayer Switching
Follow these Multilayer Switch Feature Card (MSFC) and Multilayer Switching (MLS) configuration
guidelines:
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NetFlow Data Export
You cannot use NetFlow Data Export (NDE) if you enable ASLB, and you cannot use ASLB if you
enable NDE.
VLANs
Follow these VLAN configuration guidelines:
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Switch Port Configuration
Follow these switch port configuration guidelines:
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Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4
42-10
With supervisor engine software release 5.4(1)CSX or later releases, an MSFC can be the
participating router for ASLB.
Traffic is Layer 3 switched when an MSFC routes traffic from clients. This process
Note
creates MLS entries that exist separately from the ASLB MLS entries for the same
traffic.
The aging task that removes terminated ASLB flows also purges MLS terminated flows. ASLB MLS
entries share the Layer 3 MLS cache with the MLS shortcut entries.
The MLS commands (set mls, clear mls, and show mls) do not interoperate with ASLB (set lda,
clear lda, show lda, and commit lda) commands. ASLB uses separate commands to view the
LocalDirector MLS entries.
When you enable ASLB, ASLB MLS entries are established using one flow mask, full-flow mode
(ip-flow).
When you configure ASLB, a VACL is created to redirect TCP traffic on the two VLANs to which
the LocalDirector is connected (router VLAN and server VLAN). You cannot configure any security
IOS access control lists (ACLs) or VLAN access control lists (VACLs) on these VLANs.
Dedicate the router VLAN and server VLAN for ASLB use only. Do not connect other network
devices (such as end stations and clients) to these two VLANs.
The VLANs created for ASLB propagate to other switches through VLAN Trunking Protocol (VTP)
when VTP is in the server mode. Spanning Tree Protocol runs over these ASLB VLANs on all VTP
switches in the network, introducing additional overhead over the entire network. To avoid spanning
tree propagation delays, do the following:
Configure the switch as VTP transparent so it does not populate the VLANs.
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Remove the ASLB VLANs from all trunks on all switches (enter the clear trunk command).
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Disable CDP on ports connected to the LocalDirectors (both active and standby LocalDirectors if a
backup is configured).
If you specify a port that is part of an EtherChannel, traffic is automatically redirected among all
ports in the EtherChannel.
Chapter 42 Configuring ASLB
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