Why Layer 2 Switches Need Mac Address Even It Does Not Have Any Interface

Dec 27, 2011

Why layer 2 switches need its mac address, even it does not have any interface ? (does not have stp and etc)

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Cisco Switching/Routing :: Cannot Assign Ip Address To Layer 2 Interface In 878

Apr 19, 2012

I have a cisco 878 router and I can’t assign ip address to it’s fast Ethernet interface. When I assign ip address give me this message: “you can not assign ip address to layer 2 interface”.
 
But I can not understand why give me this alert when I use a layer3 device?!

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Cisco Switches :: SG300 - Setting Management Interface In Layer 3 Mode

Jun 13, 2012

How to set the management interface on a SG300 Switch in Layer 3 mode? I've some vlans configured on the switch with interfaces in each of them:
 
Vlan 100 (10.0.1.254 /24)
Vlan 200 (10.0.2.254 /24)
Vlan 300 (10.0.3.254 /24)
...
Vlan 900 (10.0.9.254 /24)
 
Now, the management interface is listening on all interfaces (IPs). But I would like to configure the switch to only listen on 10.0.9.254. What I need to configure or whether it is possible?

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Cisco Switching/Routing :: Sg300 And SLM2024 VLAN As Layer 2 And Layer 3 Switches Connection

Mar 18, 2012

I want to setup VLAN with the switches SG300 and SLM2024. What is the suggestion to connect these 2 switches. We have the Juniper net screen.

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Cisco Switches :: Linksys SRW224G4 - What IP Address Able To Log Into Web Interface

Feb 2, 2012

I was given a linksys SRW224G4 switch .. It seems to work fine on some ports and others dont,I am tring to log into it to see what the current config is . I cant seem to find what ip address its pulling to be able to log into the web interface. I have tried the blue cable , and using hypertermail but with no luck .. I dont have com 1 or 2 as an option on my latop just com 3. how I can log into this switch and rest it back to factory specs so then I can go though and setup how i want.

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Cisco Switches :: SGE2000 - Multiple IP Address On The Same Interface?

Aug 18, 2011

configure a secondary ip address (over the same address range) in a vlan interface on the SGE2000?For example, I want Interface Vlan 10 on mw switch has 172.16.10.1/24 and 172.16.10.2/24. Is that possible? If I try I get an error message with a duplicate IP address error. On Catalyst switches it can be done, but on Small Business?

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Cisco Switches :: SG300 / Assign Static Ip Address On Vlan 1 Interface?

Dec 13, 2011

I am trying to assign static ip address on vlan 1 interface , the model no of switch is SG300 & the firmware version is 1.1.2.0 .But whenever I type the IP address & press enter , a  question is popped up asking for confirmation (switch0d851f(config-if)#ip address 1.1.1.1 255.0.0.0.

Please ensure that the port through which the device is managed has the proper settings and is a member of the new management interface.Would you like to apply this new configuration? (Y/N)[N] N )

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Cisco Switches :: SRW224G4 - Cannot Access Web View Management Interface Through IP Address

Jul 12, 2012

I am the Systems Admin at LDM Media and am trying to get some support for one of the SRW224G4 managed switches we have in our rack. The issue is as follows:

Any endpoint connected to the switch is assigned an IP address in the range of 169.254.154.XXX regardless of the switches set IP range, the second issue is that I cannot access the web view management interface through the default IP address 192.168.1.254 (and I have tried to use the last IP in the range set by the router 169.254.154.254, to no avail)
 
How to regaining control of this supposedly smart switch?

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Cisco Switches :: How To Config VLAN On 2 Switches SF300-24 Layer 3

Oct 6, 2011

now we have 2 switches: SF300-24..on one SF300-24 we config it at layer 3 mode with VLAN configuration same as following [code] And we use port 26 on 2 switches SF300-24 is trunk mode then we connect both SF300-24 switches.But on SF300-24 layer 2 cann't inderstand VLAN from Sf300-24 layer 3..How to config VLAN on 2 switches SF300-24 Layer 3 and SF300-24 layer 2?

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Cisco Switches :: SG300 Switches Have Poor Performance In Layer 3?

Jan 1, 2013

We have several of the SG300 Serices switches. We use them to route VLAN traffic to Remote Offices, Internet Connections, and WiFi Access Points.In one remote office we have a SG300-10 setup to route the HQ Network and the remote Office Subnet. The SG300 is Connected to HQ via Fiber and has multiple Tagged VLANs on it. If I do speed tests over the Fiber Link on the Incoming Tagged Netwotk I get Decent performance, 80Mbs. If I switch to a networtk that is not priginating from HQ, and have the SG300-10 route packet, I get dismal performance. 15-20Mbs.
 
I Fireded up a New SG300-28P FW v1.2.7.76. Added a the HQ VLAN 101 and new VLAN 1025 . Mapped some Tagged and untagged ports for each.  Switch was connected to HQ Network as untagged VLAN 101.  I put a laptop on an Untagged VLAN 101 port. Ran some tests, cam back with 750-850Mbs. Great.  Put the same laptop on a Tagged 101 Port, Configured the NIC for Tagged VLAN 101, Same test, same Speeds, 750-850Mbs.I then  Configured laptop for Tagged VLAN 1025. Connected to tagged VLAN 1025 port. Ran speed tests, resuts were 15-20Mbs!
 
I then  Configured laptop for Untagged VLAN 1025. Connected to unagged VLAN 1025 port. Ran speed tests, resuts were 15-20Mbs!It was only the Laptop and the Connection to the HQ net on the SG300-28P. Why is the performance of this unit soooooo poor when it needs to route?Other Switches have FW v1.0.0.27 or FW v1.1.2.0. They have Similar speed issues. All Configured for Layer 3.

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Cisco :: How To Configure IP On Layer 3 Interface On Nexus

Apr 11, 2011

With most of my Layer2/Layer3 switches, I'm accustom to giving them a SVI on my management VLAN, and calling it a day. I can't find in the Cisco Nexus guides how to do something similar; everything points to the mgmt0 physical interface, which seems like I need to uplink it to an access port on another switch. Can somebody point me in the right direction for how to do give the Nexus an IP that I can ssh/snmp into it across a trunk for management? I must just be missing the keyword.. NX-OS is still quite a different beast.I see in the manual it says: "SSH has the following prerequisites: You have configured IP on a Layer 3 interface, out-of-band on the mgmt 0 interface or inband on an Ethernet interface." Cisco Nexus 5000 Series Switch CLI Software Configuration Guide page 284, How do I configure an IP on a Layer 3 interface on a Nexus?

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Cisco WAN :: Configure More Than One Layer 3 Interface For Netflow On 3845?

Mar 20, 2013

Is it possible to configure more than one layer 3 interface for netflow on a 3845? I can't seem to do it. Is there something I am missing?

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Cisco Firewall :: Web Authentication On Layer 3 Interface With Cat 3750

Sep 12, 2012

Cisco 3750 with IP Service Image 12.2.55, Trying to enable Web Authentication on Layer 3 interface:
 
!
ip auth-proxy name bp_auth_proxy http inactivity-time 60
!
interface GigabitEthernet1/0/5
no switchport
ip address 192.168.1.27 255.255.255.0
ip access-group 101 in

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Cisco WAN :: Assign MAC ACL To Layer 2 Interface On 887VA Router?

Mar 24, 2013

I wish to assign a MAC ACL to a layer 2 interface on an 887VA router but cannot seem to see how to do this.

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Cisco WAN :: 3750 - Establish Interface Dialer On Layer 3 Switch?

May 7, 2012

Is it possible to establish a interface dialer on a layar 3 switch?Or is it only interface for routers?I have a c3750 switch (WS-C3750G-24T), and when i try to establish a dialer interface i get an error message:

[code]...

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Cisco WAN :: How To Configure Vlan Tag On Routed Layer 3 Interface In 3945 Device

Jun 10, 2012

how to configure vlan tag on routed layer 3 interface in cisco 3945 device?

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Cisco :: Bring Up A Tunnel Up-and-up Without Any Layer 3 Address?

Apr 24, 2012

I know I can bring up a tunnel up-and-up without any layer 3 address, without any ipv4 or ipv6 address (apart from tunnel source/destination of course). And I don't have to use "ip unnumbered <interface>" either. But what good is a tunnel interface with no address? Can you bridge them or something?

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Cisco WAN :: How To Put Ip Address On 3560 Port That Is In Layer 2

Jul 6, 2011

I have the following scenario. Connected to a Cisco 3560 switch (fa0/9) is another Cisco switch (that is operating at layer 2). On the other side of that second switch is a firewall. I want to send traffic from my Cisco 3560 switch to a network behind the firewall. [code] However, when I try to add the ip address to int fa0/9, I get an error. Right now, the 3560 is operating at layer 2. I think that I need to issue the command: "ip routing" to put it in layer 3, then put the ip address on port fa0/9. However, I am concerned that I will mess up my production environment. Is there any other way of doing this? The "ip route 0.0.0.0 0.0.0.0" statement sends traffic out the gateway to the Internet. I just want to send packets to 209.52.62.16/28 out int fa0/9.

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Cisco Switching / Routing :: 3560 - Accessing Management Interface Using Layer 3 Link

Apr 9, 2012

I am setting up a link between buildings that uses wireless links. I'm using Layer 3 routed ports on 2 3560 switches to handle the routing between sites. Normally I would just put these in a /30 and then the switches handle the rest. However, the wireless access points have a web interface for managing them that I want to be able to access, but it's only available on the single NIC that also carries traffic. What would be the best way of making this work? Should I make the link a /29 and give the access points an IP in the same range? If this is the case what do I use for the default gateway for the access points?
 
I have included a diagram to try to explain the issue clearer. The IP addresses in black are what I would do if this were a standard cable (and indeed this will work, but I wont be able to access the admin interface of the wireless AP) and the red ip addresses are the alternative if I use a /29 (but as I said, I'm not sure what to use for the default gateways).

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Cisco Switching/Routing :: 2900 - Nexus 7010 Layer 2 VLan 11 Active But Interface Shutdown

Sep 13, 2012

I understand the vlans on the catalyst side of the house on 2900 to 6500 Catalyst switches.
 
This 7010  running nx-os 5.1(3) I did not setup, but have to manage it.  Hasn't really been a proble till now.
 
My nexus 7010 has a Layer 2 only vlan 11. It is "Active" but the interface is "shutdown".  Yet, it is passing traffic across the directly connected  ports on the nexus 7010 and to other switches in my network.  Vlan 11 is being set out via VTP to all my switches and things are running fine.
 
I need to create another L2 only Vlan.  I can't seem to find any docs  that indicate that a Layer2 vlan Interface on nx-os should be in  "shutdown" mode as part of the setup. I do see in the docs where it has  to be set "Active" as part of the process.
 
Is this the correct way to seutp a L2 only vlan on nex-os? Leave the interface in "shutdown" but make it "Active"?
 
Mystery Vlan 4 and 6
The mystery deepens.  I have other L2 vlans ,Vlan4&6 that are NOT defined as "Interface Vlan4" in the nexus config, yet it is applied to GigE ports on the nexus and these Vlans 4/6is also being sent out VTP to all switches.  Even weirder is that these vlans have names associated with the numbers.  These are valid Vlans that were configured on the old 6509 before the Nexus was installed.
 
I have checked all switches, NONE are running in Server mode for VTP, all are in CLIENT. The nexus 7010 is the only device running in VTP Server mode. 

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Cisco Switches :: 300 Layer 3 Routing And Proxy ARP

Jul 12, 2012

I have a situation where I have ethernet traffic from two separate networks/ip subnets (Subnet A and Subnet B) on a single ethernet connection.  I have the need to separate the traffic into two separate networks and two isolated broadcast domains.  I thought this could easily be accomplished with a Cisco 300 Layer 3 switch, but I can't get it to work correctly. I have the switch set to IP routing mode.  I have three VLANs configured.  VLAN 1 sees the combined Layer 2 & 3 ethernet traffic for both subnet A and subnet B.  VLAN 10 has an IP address assigned from subnet A and is the gateway for devices within that subnet.  VLAN 20 has an IP address assigned from subnet B and is the gateway for devices within that subnet. IP proxy arp is on by default and should be active.Devices in VLAN 10 can ping devices in VLAN 20 and devices in VLAN 20 can ping devices in VLAN 10.  This appears to be working only because the switch is the default gateway for those components. 
 
No devices or servers in VLAN 1 can ping VLAN 10 or VLAN 20 components, and VLAN 10 and VLAN  20  components can not ping VLAN 1.  I analyzed the ARP traffic on VLAN 1 and the switch  is not responding with its own MAC address for requests for IPs for active devices connected to VLAN 10 or VLAN 20.  The Cisco documentation says that the device should be responding and acting as a router.I can not physically connect everthing on VLAN 1 directly to the switch, I can not make the switch the default gaeway for all devices on VLAN 1, and I can not create static routes directly to the VLAN 1 switch IP address for all devices that are part of VLAN 1, so I am stuck.  I need the switch to let VLAN 1 components automatically know what is connected to VLAN 10 and VLAN 20.
 
I am willing to scrap this approach entirely if there is an easier way to do this.  Put simply, I have a few devices in Subnet A that need to be isolated from Layer 2 & 3 traffic destined for a few devices in Subnet B, but I can't reconfigure my entire network to create these isolated broadcast domains.      

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Cisco Switches :: SGE2000P - Layer 3 Setup?

May 29, 2012

We have a potential new customer who is wanting to deploy a guest WLAN. I am happy doing this via a VLAN on the WAP4410N series AP’s. I would then create the relevant VLAN’s on the switch. Can each VLAN be assigned an IP address and allowing me to be able to add a static route on the router pointing the traffic for the Guest VLAN back to the switch? 

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Cisco :: Switches That Can Perform Task Depending On Layer?

Jul 23, 2012

I'm new and just entered in the world of studying my certification for Cisco, since I'm curious I see that there are switches that can perform task depending on the layer? I see some with specifics for Layer 2, some other for layer 3 and even some others with router capabilities!I know this is a rookie question but how do I know what the best switch for a network? or how can I identify them?

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Routers / Switches :: Setting Up A VLAN -GE-DSS-244 Layer 2 + Switch?

Mar 22, 2011

I am migrating an a group of workstations that run a fire system from one software to another. The current workstations run the following info:123.123.123.xxx 255.255.255.0The new workstations run:100.100.100.xxx 255.255.255.0There is a central switch location using a GE-DSG-244 Layer 2+ Managed switch. There are two remote location using GE-DS-82 Managed Switches.The two networks must remain isolated, yet use the same fiber communications. The central switch connects to the two location using MM Fiber. From my research I believe I need to use the 802.1q standard to allow port trunking between the two switches.

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Cisco Switches :: SF300-24 Layer 3 Mode Routing?

Dec 14, 2012

i've a problem with my SF300-24 routing. That's my network configuration:
 
Port 1 to 12 assigned to VLAN 10
Port 13 to 23 assigned to VLAN 20
Port 24 has an ip 10.17.7.254 to connect with my deafult route, beacuse I've also a Linksys RV042 router, connected in turn with my ISP router, having an ip 10.17.7.1.

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Cisco WAN :: C6509E Multicast Configuration For Only Layer 3 Switches

Jun 13, 2011

If there is C6509E as core switches and C3750 Switches running layer 3 at the User dept uplink to the C6509E Switches, what will be the multicast command that should be implemented at both end? CGMP or IGMP or do not need to implement this snooping as well?
 
Users (IPTV) -> C3750 (Access Switch) -> C6509E (Core Switch) -> C6509E (Server Farm Switch) -> IPTV Servers
 
Do we need to configure multicast at C3750 Switches (Access Level) at the User dept? Let's say the IPTV Mulitcast is 239.1.1.1. How can we build up this multicast configuration based on this scenario?

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Cisco Switches :: SG300 In Layer 3 For Routing Over MetroE

May 12, 2013

I have a project I am working on that will require routing over a MetroE circuit to connect a few sites together back to HQ. Although, I know this can be accomplished several ways, I have come up with a solution that I think will work, but would like you all's input as to whether this is adequate and if my thoughts on how to properly "organize" the network are right.
 
I have been working with the SG300 line in Layer 3 mode and have not had any issues in a test setup I have here in the office. Basically my thought is to have a single VLAN/subnet allocated for each physical site. That will handle the basic interoffice connectivity etc. I also have a need to prioritize voice/video traffic throughout the entire network. My plan was to create an additional VLAN/subnet to house the teleconferencing equipment. Thats pretty much the jist of the setup. My only question is how to properly prioritize the voice/video VLAN.

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Cisco Switching/Routing :: Does Ip Helper Address Work On A Layer 2 Switch 2950

Jan 9, 2012

I would like to know if ip helper-address feature is working on a layer 2 switch (2950,2960) or you should use a Layer 3 switch to do that?

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Cisco Switches :: Possible To Stack 3Com 3cr17161-91 With Another Layer 3 Switch

Sep 25, 2012

I would like to ask if it is possibe to stack a 3Com 3cr17161-91 to a layer 3 Cisco Switch? The two will be stacked using the avaialble SFP modules.

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Cisco Firewall :: Connecting Single ASA-5520 To Two Layer 3 Switches?

Sep 30, 2011

Connecting ASA 5520 to two Catalyst 3560G layer 3 switches. What's the best practice to connect the asa-5520 at the edge, to the core of my network? What I'm looking to do is connect two routed gigabit ports (gi0/2 and gi03) to two seperate layer 3 routed ports on catalyst 3560G. I'm wondering how to do it, or if there's any type of failover method? I'm running EIGRP in the network and the link to the first core switch has a /30 point to point connection. Everything works fine, I'm just not sure how to connect the second switch to the firewall. Should I use the a different /30 for the point to point connection to csw02 gi0/48? (See attachment) How would this affect traffic flowing through this interface? Would I have to duplicate rules I have on my inside (gi0/2) interface? Is there a way to make the inside2 interface standby some how? I want to know the best way to set this up, so in the event csw01 goes down I don't loose internet. Will EIGRP work it's magic and only use 1 path to the ASA? Should I even be using routed interfaces on the ASA and just use trunked mode?Running ASA 8.4?

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Cisco Switches :: SF300-24 Can't Change To Layer 3 System Mode

Mar 16, 2012

My SF300-24 switch has been working 100% as a backup switch for a client of mine. At my clients premises it was running 3 Vlan's and doing inter VLAN routing. When my client received their original switch back, I obviously brought my SF300-24 back to the workshop, reset it back to Factory defaults and tried to do a fresh installation on it. I can not get it to change from Layer 2 to Layer 3! I installed the latest firmware but still no go.
 
Everything works a 100% via the console, but when I go to the System Mode menu and try and edit it, it justs sits at layer 2 and will not chage to layer 3!

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Cisco Switching/Routing :: Can Layer 2 2950 Switch Be Used As DHCP Server With Its Own Address Pool

Mar 18, 2009

Can a layer 2 cisco 2950 switch be used as a dhcp server with it's own address pool.

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Cisco Switching/Routing :: Catalyst 4507 - Configuring Layer 3 Switches?

Sep 5, 2012

I've been conducting research on configuring 3 distribution switches in my network which are Cisco Catalyst 4507's to communicate with our core over layer 3. Our core switch which is already configured at Layer 3 for intervlan routing is a Cisco Catalyst 6509.
 
I've got the configuration portion complete and all devices are able to communicate my only question is about QoS. Do I have to configure QoS at the layer 3 interfaces for voice, if so how is that completed. We have several vlans and separate the vlans for each building by voice and data. We only configure ports on the access switches with voice vlans for QoS and we use the auto qos option on these interfaces.

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