Verify that the Isilon interfaces are assigned to the Isilon virtual-network 1801 on both leaf switches. Port channels 3, 4, 5, and 6 connect to the Isilon nodes. The output below is from switch Leaf2A.
S5248-Leaf2A# show virtual-network vlan
Vlan Virtual Network Interface
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1801 1801 port-channel1000, port-channel3, port-channel4, port-channel5, port-channel6
1811 1811 port-channel1000, ethernet1/1/21, ethernet1/1/22
1812 1812 port-channel1000
1814 1814 port-channel1000
1815 1815 port-channel1000
1819 1819 port-channel1000
1820 1820 port-channel1, port-channel1000, port-channel2
3939 3939 port-channel1000
4091 4091 port-channel1000
S5248-Leaf2A#
Verify the port channels and associated member ports. The output below is from switch Leaf1B.
S5248-Leaf2A# show port-channel summary
Flags: D - Down I - member up but inactive P - member up and active
U - Up (port-channel) F - Fallback Activated IND - LACP Individual
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Group Port-Channel Type Protocol Member Ports
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1 port-channel1 (U) Eth DYNAMIC 1/1/16:1(P)
2 port-channel2 (U) Eth DYNAMIC 1/1/15:1(P)
3 port-channel3 (U) Eth DYNAMIC 1/1/19:1(P)
4 port-channel4 (U) Eth DYNAMIC 1/1/17:1(P)
5 port-channel5 (U) Eth DYNAMIC 1/1/20:1(P)
6 port-channel6 (U) Eth DYNAMIC 1/1/18:1(P)
96 port-channel96 (U) Eth STATIC 1/1/54(P)
97 port-channel97 (U) Eth STATIC 1/1/53(P)
1000 port-channel1000 (U) Eth STATIC 1/1/49(P) 1/1/50(P) 1/1/51(P) 1/1/52(P)