03-21-2008 08:14 PM - edited 03-05-2019 09:54 PM
I read that per-destination load-sharing via CEF is enabled by default on the Sup720.
I have a few equal-cost static routes and figured that per-destination load-sharing would take place over the equal-cost routes However, when I run the command 'show ip cef 192.168.133.0', There's no mention of load-sharing in the output. Is there something else that needs to be configured ?
Thanks for your help.
Mike
NWQ6513#sh ip cef 192.168.133.254
192.168.133.0/24, version 12849, epoch 0
0 packets, 0 bytes
Flow: AS 0, mask 24
via 172.25.0.3, 0 dependencies, recursive
traffic share 1
next hop 172.25.0.3, Vlan901 via 172.25.0.3/32
valid adjacency
via 172.25.0.5, 0 dependencies, recursive
traffic share 1
next hop 172.25.0.5, Vlan901 via 172.25.0.5/32
valid adjacency
0 packets, 0 bytes switched through the prefix
tmstats: external 0 packets, 0 bytes
internal 0 packets, 0 bytes
NWQ6513#sh ip route 192.168.133.0
Routing entry for 192.168.133.0/24
Known via "static", distance 1, metric 0
Routing Descriptor Blocks:
* 172.25.0.3
Route metric is 0, traffic share count is 1
172.25.0.5
Route metric is 0, traffic share count is 1
NWQ6513#sh ip arp 172.25.0.3
Protocol Address Age (min) Hardware Addr Type Interface
Internet 172.25.0.3 42 001b.d494.cb30 ARPA Vlan901
NWQ6513#sh ip arp 172.25.0.5
Protocol Address Age (min) Hardware Addr Type Interface
Internet 172.25.0.5 42 001b.d4a9.d650 ARPA Vlan901
NWQ6513#sh ip cef detail
IP Distributed CEF with switching (Table Version 12850), flags=0x0
841 routes, 0 reresolve, 0 unresolved (0 old, 0 new), peak 44
71 instant recursive resolutions, 0 used background process
841 leaves, 108 nodes, 226808 bytes, 12862 inserts, 12021 invalidations
2 load sharing elements, 672 bytes, 2 references
universal per-destination load sharing algorithm, id FDDB7516
3(0) CEF resets, 2 revisions of existing leaves
Resolution Timer: Exponential (currently 1s, peak 2s)
0 in-place/0 aborted modifications
refcounts: 29479 leaf, 27904 node
03-22-2008 09:09 AM
It is load-sharing as both next-hops are listed in CEF and the IP Route output.
__
Edison.
03-22-2008 11:12 AM
Thanks Edison, I appreciate your input.
I just thought that the output of the command would specifically state that the network traffic was getting load balanced via per destination.
-MIke
03-22-2008 11:43 AM
Hi Mike,
It does. Look at the show ip cef detail output more closely.
NWQ6513#sh ip cef detail
IP Distributed CEF with switching (Table Version 12850), flags=0x0
841 routes, 0 reresolve, 0 unresolved (0 old, 0 new), peak 44
71 instant recursive resolutions, 0 used background process
841 leaves, 108 nodes, 226808 bytes, 12862 inserts, 12021 invalidations
2 load sharing elements, 672 bytes, 2 references
universal per-destination load sharing algorithm, id FDDB7516
3(0) CEF resets, 2 revisions of existing leaves
Resolution Timer: Exponential (currently 1s, peak 2s)
0 in-place/0 aborted modifications
refcounts: 29479 leaf, 27904 node
03-22-2008 12:32 PM
Great. Got it. Thanks again.
-Mike
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