I'm trying to find more information about the following scenarioof load
balancing on a 7600.
+-----+
| |
--PW--+ +==GEC==
| +
+-----+
GEC is EVC based and there is a PW being terminated on the above 7600.The PW is
coming through a 10G link from another
router and the GEC is 2x1G.
Now i have three choices:
1) PW terminates on the EVCs under the port-channel interface
2) PW terminates on a vlan interface whose bridge-domain is used on the EVCs
under the port-channel interface
3) PW terminates on a vfi with a vlan whose vlan bridge-domain is used on the
EVCs under the port-channel interface
According to CCO
(http://www.cisco.com/en/US/docs/routers/7600/install_config/ES40_config_guide/es40_chap4.html#wp1751021),
in order to
have per L2 flow load balancing occur on the egress direction towards the GEC i
have to use the 1st solution (EVC under
Po), sinceper flow load balancing doesn't work with bridge-domain.
The question is: In the 1st solution do i need a ES+ card on the other
direction (towards the core) too, and if yes, why?
I can understand the need for ES+ in solutions #2 and #3, because towards the
core the label imposition is happening on
the egress card, but in solution #1 i don't see such a case. Unless something
is happening due to egress load-balancing
on the GEC interface.
--
Tassos
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