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Chapter 7

Multi-Layer Switching (MLS)

Enabling MLS on the MLS-SE

As mentioned, the only time you need to actually enable MLS on the MLS-
SE is when it has been disabled or on a system on which MLS is off by
default.

To enable MLS on the MLS-SE, issue the command set mls enable.

Here is an example:

Switch2> (enable) set mls enable

Multilayer switching is enabled

Switch2> (enable)

Cache Entries

MLS entry or shortcut cache exists on the NFFC for the 5000 series switches
and on the PFC for 6000 series switches. The purpose for the cache is con-
sistent across all platforms. The cache is a layer 3 switching table. It main-
tains the flow information that facilitates MLS.

Here is a sample of a layer 3 cache table:

Switch1> (enable) sho mls entry
Dest-IP Source-IP Prot DstPrt SrcPrt Dest-Mac Vlan EDst ESrc DPort SPort
Stat-Pkts Stat-Bytes Uptime Age
--------------- --------------- ----- ------ ------ ----------------- ----
---- ---- ------ ------ ---------- ----------- -------- --------
MSFC 10.10.100.5 (Module 15):
172.16.10.1 - - - - 00-30-96-2d-24-20 188 ARPA
ARPA 2/7 2/6 870 157785 00:05:29 00:00:27
172.16.55.115 - - - - 00-30-96-2d-24-20 188
ARPA ARPA 2/7 2/6 2407 642886 00:00:39 00:00:00
172.16.96.101 - - - - 00-d0-bc-f3-69-44 4
ARPA ARPA 2/2 2/7 2710 2200670 00:12:23 00:00:00
172.16.8.35 - - - - 00-d0-bc-f3-66-9c 180
ARPA ARPA 3/7 3/3 76634 24951932 00:24:31 00:00:00
172.16.8.17 - - - - 00-30-96-2d-24-20 188
ARPA ARPA 2/7 2/6 81752 26599352 00:18:32 00:00:00
172.16.8.102 - - - - 00-30-96-2d-24-20 188
ARPA ARPA 2/7 2/6 313 148298 00:00:24 00:00:22

Cache entries are kept while the flow is active. Once the flow no longer

receives traffic, the cache entry gets aged out and removed from the layer 3

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