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Author Topic: Cisco Nexus dual homed fex  (Read 1586 times)

ascii

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Cisco Nexus dual homed fex
« on: May 27, 2014, 08:40:25 AM »
Hello together,

i have a setup with dual homed fex fabrics.
the module discovery is going nuts since it finds the fex on both Nexus 5k

Quote
27.May 14 8:05   kre-f01-n5ks    New Fex-102 Nexus2200HP Chassis module with SN:FOC174XXXXX found in Fex-102 Nexus2200HP Chassis
27.May 14 8:05   kre-f01-n5ks    New Fex-101 Nexus2200HP Chassis module with SN:FOC174YYYYYY found in Fex-101 Nexus2200HP Chassis
27.May 14 8:05   kre-f01-n5ks    New Fex-102 Fabric Extender Module: 16x10GE, 8x10GE in FixedModule-1 module with SN:FOC17386XXX found in Fex-102 Fabric Extender Module: 16x10GE, 8x10GE in FixedModule-
27.May 14 8:05   kre-f01-n5ks    New Fex-101 Fabric Extender Module: 16x10GE, 8x10GE in FixedModule-1 module with SN:FOC17386YYY found in Fex-101 Fabric Extender Module: 16x10GE, 8x10GE in FixedModule-
27.May 14 8:05   kre-f01-n5ks    Module Fex-102 Nexus2200HP Chassis SN:FOC174XXXXX in Fex-102 Nexus2200HP Chassis has been removed
27.May 14 8:05   kre-f01-n5ks    Module Fex-101 Nexus2200HP Chassis SN:FOC174YYYYYY in Fex-101 Nexus2200HP Chassis has been removed
27.May 14 8:05   kre-f01-n5ks    Module Fex-102 Fabric Extender Module: 16x10GE, 8x10GE in FixedModule-1 SN:FOC17386XXX in Fex-102 Fabric Extender Module: 16x10GE, 8x10GE in FixedModule- has been removed
27.May 14 8:05   kre-f01-n5ks    Module Fex-101 Fabric Extender Module: 16x10GE, 8x10GE in FixedModule-1 SN:FOC17386YYY in Fex-101 Fabric Extender Module: 16x10GE, 8x10GE in FixedModule- has been removed
27.May 14 8:05   kre-f01-n5k    New Fex-102 Nexus2200HP Chassis module with SN:FOC174XXXXX found in Fex-102 Nexus2200HP Chassis
27.May 14 8:05   kre-f01-n5k    New Fex-101 Nexus2200HP Chassis module with SN:FOC174YYYYYY found in Fex-101 Nexus2200HP Chassis
27.May 14 8:05   kre-f01-n5k    New Fex-102 Fabric Extender Module: 16x10GE, 8x10GE in FixedModule-1 module with SN:FOC17386XXX found in Fex-102 Fabric Extender Module: 16x10GE, 8x10GE in FixedModule-
27.May 14 8:05   kre-f01-n5k    New Fex-101 Fabric Extender Module: 16x10GE, 8x10GE in FixedModule-1 module with SN:FOC17386YYY found in Fex-101 Fabric Extender Module: 16x10GE, 8x10GE in FixedModule-
27.May 14 8:05   kre-f01-n5k    Module Fex-102 Nexus2200HP Chassis SN:FOC174XXXXX in Fex-102 Nexus2200HP Chassis has been removed
27.May 14 8:05   kre-f01-n5k    Module Fex-101 Nexus2200HP Chassis SN:FOC174YYYYYY in Fex-101 Nexus2200HP Chassis has been removed
27.May 14 8:05   kre-f01-n5k    Module Fex-102 Fabric Extender Module: 16x10GE, 8x10GE in FixedModule-1 SN:FOC17386XXX in Fex-102 Fabric Extender Module: 16x10GE, 8x10GE in FixedModule- has been removed
27.May 14 8:05   kre-f01-n5k    Module Fex-101 Fabric Extender Module: 16x10GE, 8x10GE in FixedModule-1 SN:FOC17386YYY in Fex-101 Fabric Extender Module: 16x10GE, 8x10GE in FixedModule- has been removed
27.May 14 7:05   kre-f01-n5ks    New Fex-102 Nexus2200HP Chassis module with SN:FOC174XXXXX found in Fex-102 Nexus2200HP Chassis
27.May 14 7:05   kre-f01-n5ks    New Fex-101 Nexus2200HP Chassis module with SN:FOC174YYYYYY found in Fex-101 Nexus2200HP Chassis
27.May 14 7:05   kre-f01-n5ks    New Fex-102 Fabric Extender Module: 16x10GE, 8x10GE in FixedModule-1 module with SN:FOC17386XXX found in Fex-102 Fabric Extender Module: 16x10GE, 8x10GE in FixedModule-
27.May 14 7:05   kre-f01-n5ks    New Fex-101 Fabric Extender Module: 16x10GE, 8x10GE in FixedModule-1 module with SN:FOC17386YYY found in Fex-101 Fabric Extender Module: 16x10GE, 8x10GE in FixedModule-

rickli

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Re: Cisco Nexus dual homed fex
« Reply #1 on: May 27, 2014, 06:58:58 PM »
I think the root cause is a too small module index field. Excerpt from the 1.1 readme's DB changes:

-- Not mandatory, but is needed on Nexus devices with ridicilousely high indexes to avoid false module changes:
ALTER TABLE modules MODIFY COLUMN modidx INT UNSIGNED DEFAULT 0;


But you're right, I need to find a way to handle "duplicate" fexes (and DAC/Twinax cables also showing same serial in 2 different devices).
Please consider Other-Invoices on your NeDi installation for an annual contribution, tx!
-Remo

gerold

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Re: Cisco Nexus dual homed fex
« Reply #2 on: June 07, 2014, 04:36:36 PM »
I'd suggest to make this a mandatory change because

a) This matches the RFC4133 definition:
  PhysicalIndex ::= TEXTUAL-CONVENTION
  [...]
    SYNTAX Integer32 (1..2147483647)

b) other vendors also use large modidx values, for example HP in their 3900 series stacked switches.