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Forum Replies

  1. Hi Jeffery,

    Those commands are all you need to put two interfaces in VLAN 50. What’s the output of the following commands?

    • show vlan (to verify that the VLAN exists)
    • show ip interface brief (to check the interface statuses
    • show run int fa0/1 and show run int fa0/2 (to make sure no other commands are applied

    The configuration of VLANs is the same on any of the Catalyst switches…the 2950, 2960, 3550, 3560, 3750 and 4500/6500 series use the same commands. The same thing applies to most of the routers.

    Also, make sure your windows firewall is not blocking ICMP

    ... Continue reading in our forum

  2. Hi Muhammad,

    On 802.1Q trunk links, we can send tagged and untagged Ethernet frames. Frames that are untagged are considered to belong to the native VLAN. It is possible to configure your switches to tag the native VLAN btw.

    On the native VLAN, you’ll find frames from protocols like CDP, DTP, etc.

    On 802.1Q trunk links, we can send tagged and untagged Ethernet frames. Frames that are untagged are considered to belong to the native VLAN. It is possible to configure your switches to tag the native VLAN btw.

    On the native VLAN, you’ll find frames from protocols li

    ... Continue reading in our forum

  3. Hello Abhishek.

    There are advantages and disadvantages to creating a trunk between the Router and the Cisco 3850 switch. It all depends on what you want to achieve.

    You would want to do this if:

    1. you want all of the routing of your network to take place at the Router
      a) advantages of this include: to be able to apply security, access lists and other policies at a single location
      b) disadvantages include single point of failure for routing
    2. if you want to allow VLANs to span multiple areas of your network (if the Router is a layer 3 switch)

    You would avoid doin

    ... Continue reading in our forum

  4. Hello Rene,
    it would be good to mention somewhere about default-gateway vs default-network config. I have never had a chance to use default-network command. Is it usable? if so in what scenarios. I assume it can be pointing to L3 GW network address if L3 routing is enabled on a L3 switch. Please elaborate either privately or add some content if possible.

  5. Hello Vitaly

    There are essentially three ways to configure a gateway of last resort on an L3 switch or on a router. These differ in their implementation and their functionality.

    The ip default-gateway command should only be used when routing is disabled. It essentially tells the device what its default gateway is much like a PC has the default gateway configured. It is used only for the purposes of connectivity with subnets other than its own.

    The ip default-network command can be used only when routing is enabled. When you configure ip default-network the

    ... Continue reading in our forum

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