Hi Adam, please see inline below:
At 03:58 PM 8/4/2015 Tuesday, Adam Vitkovsky quipped:
Has anyone played with Anycast HSRP with fabric path please?
Just would like to confirm I understand it correctly.
So ISIS calculates best path to the anycast switch ID advertising the HSRP MAC
There are no MAC advertisements in FP, routing is based on switch IDs (SID).
and since I can manipulate metrics on links
between spine and leaf switches I should be
able to dictate which leaf switches should be using which GWs right?
You could do that but the idea with anycast HSRP
is that all participating HSRP routers equally
distribute the L3 switching load.
Because only paths to anycast switch ID with
equal costs are considered for multipathing
right? (i.e. thereâs no unequal cost load sharing correct?)
Correct, it is ECMP only.
The model is that all anycast HSRP routers have
their own unique SID but also an emulated SID
shared among them all. All advertise that ESID,
and any FP switch with equal path cost to 2 or
more of those will load balance traffic destined to the HSRP MAC among them.
Typical topology is spine/leaf but any topology
will work. Note that only the control-plane
Active router is the one that responds to ARP &
sources HSRP hellos with the HSRP MAC (using the
ESID as the source SID in FP frames).
See section 10 here for a bit more:
http://www.cisco.com/c/en/us/products/collateral/switches/nexus-7000-series-switches/white_paper_c11-687554.html
Hope that helps,
Tim
Tim Stevenson, tstev...@cisco.com
Routing & Switching CCIE #5561
Distinguished Engineer, Technical Marketing
Data Center Switching
Cisco - http://www.cisco.com
+1(408)526-6759
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