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4 votes

Cisco native port has to be included in allowed vlans of trunk

Reference: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/configuration/guide/cli/CLIConfigurationGuide/AccessTrunk.html#18749 Emphasis mine: By default, a trunk port sends ...
Todd Wilcox's user avatar
  • 2,871
4 votes
Accepted

LACP Trunk from Cisco to Fortinet

If the way i have done is not true LACP, how come it is working with the Fortinet (which is set for 802.3ad Aggregate)? Seems setting channel-protocol lacp on my ports makes no difference (is it LACP ...
YLearn's user avatar
  • 1,247
3 votes

Cisco native port has to be included in allowed vlans of trunk

The reason i ask i saw other configs in forums is they did not include the native VLAN in the list of allowed VLANs, i saw in a couple of places and wanted to check if a typo. The one big reason ...
Ron Maupin's user avatar
  • 3,273
3 votes
Accepted

What is wrong with ESXi VMKernel Port in Active/Active configuration?

The management vmk in ESXI assumes the MAC address of the Nic in the first PCI slot during the initial set-up. This is how it has worked forever. This can break things only when the physical device ...
Kevin's user avatar
  • 46
2 votes
Accepted

Host flapping between switchport and Etherchannel

Yes there is a problem and you are one step away from making a loop, but its not because of keeping Po1 and interface connected to the router in the same VLAN. When you Stack two switches, They work ...
Anirudh Malhotra's user avatar
2 votes

If you switch an interface's vlan does it stop traffic?

The answer is Yes and No. You can make the changes, BUT hosts and devices won't be able to communicate with each other until and unless the ports they're connected to are members of the same VLAN. So ...
joeqwerty's user avatar
  • 111k
2 votes

What is wrong with ESXi VMKernel Port in Active/Active configuration?

I have run an extremely similar setup for many years without any issues. How have you configured the switch ports? You shouldn't do anything special (no (M)LAG/LACP) since ESXi takes care of ...
Zac67's user avatar
  • 11.9k
2 votes
Accepted

Is physical connection sufficient to register a MAC address to a switch?

Working link is not sufficient for working MAC level. Consider different VLANs to be very similar to different cabling and a switch. So you need to have a proper (tagged) VLAN for both your computer ...
d.c.'s user avatar
  • 267
2 votes
Accepted

Cisco Catalyst "Traffic Spanning" not working, multiple methods attempted, not sure what to try next

Based on the comments, it seems that you had not created the VLAN in the VLAN database on the switch. Not creating VLANs with the global vlan command for a stand-alone switch is a common source of ...
Ron Maupin's user avatar
  • 3,273
2 votes

How do I change my password on a Cisco Catalyst 2960 switch?

switch>enable switch# config t Switch(config)#username gozulin privilege 15 password yourpassword Switch(config)end switch# wr Note#1: you don't need to enter 0 or 7 --- try that. Privilege 15 ...
LanWanTech's user avatar
1 vote

How to check total operating hours for Cisco Catalyst switches?

Check the manufactured date to make sure. CISCO material usually don't lay 2/3 years in a stock house, so the date might give you an idea of the age and if refurbished. You can use cisco sn lookup ...
yagmoth555's user avatar
  • 17.2k
1 vote

802.1q multicast blocked by Cisco router

That particular switch model does not allow tagging of the native VLAN, per the Cisco documentation: General Restrictions Native VLAN tagging is not supported, and the vlan dot1q tag native ...
Ron Maupin's user avatar
  • 3,273
1 vote

What is wrong with ESXi VMKernel Port in Active/Active configuration?

The switch port config that you posted shows that you are using a port channel on the catalyst switches. Just don't do that! With standalone ESXi hosts this is not supported. ESXi takes care of load ...
VFrontDe's user avatar
  • 1,508
1 vote

Can't ping outside IP address

If you have more and more computer having this issue, and configuring static IP solves the problem, have a look at dhcp configuration. If the network range configured in dhcp is /24 and you start ...
bgtvfr's user avatar
  • 1,272
1 vote

Cisco native port has to be included in allowed vlans of trunk

The NATIVE VLAN should NOT be included on the "switch allowed vlan" list. However, the NATIVE VLAN should also NOT be used for ANYTHING else. If you have a vlan defined for any device/access port, ...
Greg's user avatar
  • 11
1 vote

LACP Trunk from Cisco to Fortinet

If the way i have done is not true LACP, how come it is working with the Fortinet (which is set for 802.3ad Aggregate)? Seems setting channel-protocol lacp on my ports makes no difference (is it ...
user5870571's user avatar
  • 3,164
1 vote

Putty blank when connected to Cisco Catalyst 3500

Baud rate is the issue here, try and use all the baud rate above one at a time to see which one go with the baud rate configured for the switch.
youwin's user avatar
  • 11
1 vote

Trying to use Azure AD as LDAP server with Cisco Catalyst IP Base

Azure Active Directory supports various authentication APIs and protocols, but LDAP isn't amongst them. However, Azure AD Domain Services (currently in preview) will be able to help you here, because ...
Massimo's user avatar
  • 71.4k
1 vote

"route" sub-command does not exits in "ip" command on Cisco 2960-S

It depends on the software features of the Switch what options are available. http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-2960-s-series-switches/data_sheet_c78-726680.html ...
Diamond's user avatar
  • 9,191
1 vote

"route" sub-command does not exits in "ip" command on Cisco 2960-S

The 2960-S is a layer 2 switch. If you need routing between VLANs, you need a router.
David Schwartz's user avatar

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