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The unofficial room for all things Cisco Systems, Inc. Employees, customers, and people generally interested in tomorrow's technology are welcome.3 Servers

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24 Jul 2020
@exfat_matt:matrix.orgexFATmattThis is what the universities will use for semester-style learning, it's called NetAcad: https://www.netacad.com/ You can find the official cert books on O'Reilly media: https://www.oreilly.com/ And these are configuration guides but have a lot of good information in them and are used heavily for training Cisco: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9600/software/release/17-2/configuration_guide/b-172-9600-cg/b-172-9600-cg_contents.html20:29:25
@exfat_matt:matrix.orgexFATmattCPLL is still the best in my opinion, but they are all good and each provide a different perspective. The config guides are completely free -- it might seem irrelevant but they have a lot, if not more, of the same information all the formal training has.20:32:48
6 Sep 2020
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12 Sep 2020
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15 Sep 2020
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29 Sep 2020
@devrandom:hackers.towndevrandomQuestion if anyone can answer. I have 3 VLANs routed through the native VLAN (3750X switch). I would have expected I only needed "ip helper-address" set on the VLANs but DHCP (which is on one of the VLAN subnets) didn't work right (on the other VLAN subnets) until I set the ip helper on the native VLAN as well. Any thoughts why this would be the case?19:45:13
2 Oct 2020
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12 Oct 2020
@exfat_matt:matrix.orgexFATmatt
In reply to @devrandom:hackers.town
Question if anyone can answer. I have 3 VLANs routed through the native VLAN (3750X switch). I would have expected I only needed "ip helper-address" set on the VLANs but DHCP (which is on one of the VLAN subnets) didn't work right (on the other VLAN subnets) until I set the ip helper on the native VLAN as well. Any thoughts why this would be the case?

Hi devrandom! Apologies for the late reply.

Can you clarify on '3 VLANs routed through the native VLAN'? At any rate I believe you may have answered your own question. If the SVI you setup on the native VLAN is what the clients are using as their default gateway, then that is where you need to apply the helper address. Check out this link:

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/15-2_4_e/configurationguide/b_1524e_consolidated_3750x_3560x_cg/b_1524e_consolidated_3750x_3560x_cg_chapter_0100001.html#ID388

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