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multilayer switching MLS-RP,8 bit Xtag value

Hi everybody

How is everyone doing?

I was reading about multilayer switching of past days.  This is what my book says about " 8 bit Xtag value" :

"In an environment where multiple MLS-RPs are present, the MLS-SE must be able to differentiate

between each MLS-RP. This can be done based upon the MAC address of each MLS-RP; however,

if there are thousands of flow entries in the MLS cache and if each of the entries associated with an

MLS-RP that has just gone down need to be flushed, searching through the cache based upon a

48-bit MAC address value can take some time. To facilitate faster cache purges, an 8-bit XTAG

value is assigned to MLS-RP, which acts like an index for each MLS-RP, allowing the MLS-SE to

differentiate between the flow entries associated with each MLS-RP much more quickly."

So xtagvalue basically allows switch to locate entries faster. But when I look at the contents of mls cache, as shown below,I don't see any xtag value.

Switch-A> (enable) show mls entry ip

                                  Last    Used

Destination IP  Source IP       Prot DstPrt SrcPrt Destination Mac   Vlan Port

--------------- --------------- ---- ------ ------ ----------------- ---- -----

MLS-RP 192.168.2.2:

No entries

MLS-RP 192.168.1.1:

192.168.1.100   192.168.2.100   -    -      -      00-10-a4-e0-1e-d3 1    2/2

192.168.2.100   192.168.1.100   -    -      -      00-06-53-fe-84-20 2    2/3

Any help will be greatly appreciated.

thanks and have a great week ( It is almost over thanks God!)

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