Cisco :: Switch IP Addressing
Jan 2, 2013
I'm on my way of taking the CCNA Exploration, and even though I haven't got to the LAN Switching and Wireless course, one question does bug me. In your average LAN, does your average switch has an ip address, or is it a 'dumb' device like a repeater ? Is the same true for layer 2 switches and layer 3 switches or is there a difference in terms of IP addressing ? Can you even assign an IP address to a switch ? Would you want to do that and why ?
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Jan 28, 2011
I am looking at this doc to use an ASA + 2911 to do Policy Based Routing with multiple ISPs.From the linked doc, under the PBR scenario, what should the IP addresses be for the routers connection to the ISPs? It isnt labeled.
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Oct 31, 2011
can i use both class B and class C at the same time?If so, what should i do with class B? and with the other Class C?i got 500 computer into 5 segments
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Mar 4, 2012
I need to provide logical addressing this network using class C but I have been given no address to start with, only the network diagram:
[URL]
How do I even start this? How do I know which address to use?
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May 8, 2011
I have a IBM T23 laptop that I have reformatted and am trying to log onto my wireless internet via a linksys pcmcia card which When I try to connect it tells me I have private IP address and I am not sure how I can reconfig so that I can connect via my router to the internet.
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Jan 17, 2012
Keep getting DHCP timeouts 169.254.x.x addressing. I think that the client laptop is not giving a response to the REQ from the DHCP server. Am I correct in my interpretation of the debug?
00:21:d7:93:f9:40 from Disassociated to Idle
*apfReceiveTask: Jan 18 13:48:24.162: 58:94:6b:d0:41:08 0.0.0.0 DHCP_REQD (7) Deleted mobile LWAPP rule on AP [00:21:d7:93:f9:40]
*apfReceiveTask: Jan 18 13:48:24.162: 58:94:6b:d0:41:08 Username entry deleted for mobile
*apfReceiveTask: Jan 18 13:48:24.162: 58:94:6b:d0:41:08 apfMs1xStateDec
*apfReceiveTask: Jan 18 13:48:24.162: 58:94:6b:d0:41:08 Deleting mobile on AP 00:21:d7:93:f9:40(0)
*DHCP Proxy DTL Recv Task: Jan 18 13:48:37.073: 58:94:6b:d0:41:08 DHCP received op BOOTREQUEST (1) (len 308,vlan 0, port 29, encap 0xec03)
*DHCP Proxy DTL Recv Task: Jan 18 13:48:37.073: 58:94:6b:d0:41:08 DHCP processing DHCP DISCOVER (1)
[code]....
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Oct 25, 2011
I have a customer using a RVS4000, DHCP is enabled; the unit is set as gateway but there are no DHCP address assingments coming from the router.
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May 27, 2013
I read in the RV082 user manual can I configure a Ip address class C in the LAN interfaces.I need to know if the router support a class B addressing.
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Jan 30, 2012
I have been assigned to create a basic IP Addressing Scheme. The company has a single class B private address range of 172.16.11.0/16 and it needs to be divided into four subnets. They are all based on a single router.
Subnet A: 500 hosts
Subnet B: 200 hosts
Subnet C: 50 hosts
Subnet D: 20 hosts
How can I subnet them correctly and how would I make an addressing scheme for each subnet? (Host range, server, peripherals, gateway address? etc.)
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Aug 26, 2012
Is there any limitations of network size for an interface in a WLC 5508? Any recomendations of netmask size? Maximum /24, maximun /21?
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May 9, 2011
How does one allow /31 mask for an management interface on an ASA5540 using version 8.3(1)?
I need to configure a 192.168.x.y /31 on the management 0/0 interface of a ASA5540 and it is providing me with the following error:ERROR: /31 mask is not allowed
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Sep 25, 2012
I am carving up an internet Class C for customer. This class C is used by 3 distinct QA, Corporate and Production firewalls. I want to carve up IP space so there is a /26 for each environment. The issue I have is the firewalls may need communication with each other via the public IP space. Currently I don’t have any L3 switches in between the firewalls and the edge internet router. So with subnetting, it would seem I need to push everything through the internet router for the intra-firewall communication.I would rather not push this traffic through the edge router, so I came up with an idea to allocate all firewall outside interface IP’s in the 4th (last remaining) /26. That way, I can allow firewalls to communicate over the primary interface IP’s, which will all be in the same subnet – without going through a routing “engine”/device.
For the actual environment subnets (NAT's on respective firewalls), I create a static route on the edge router pointing to each of the firewall’s primary IP’s for the respective environment routes (the first 3 - /26’s).This is still a beta design, but I have done this before on small scale when ISP gave me 2 subnets for example, assuming I was going to put a router in between the customer firewall and ISP. I would use the “routed subnet” on the ASA interface, and then pull the NAT’s from the other subnet. The ISP would have to add a static route directing the NAT subnet to the “routed subnet” correct IP - which would be the firewall outside interface primary IP.I recently found out that with ASA OS 8.4.3 and up, ASA will not proxy arp for IP’s not in its local interface subnet. This means the ISP/router will have to assign static ARP entries on the edge router. This can get messy after the first few NAT entries. So I am debating the design now. I think this kind of stuff going forward won’t be worthwhile with newer ASA 8.4.3 code.
How to communicate between different ASA’s, while still carving up the Class C into usable smaller subnets? The primary reason for doing this in the first place is to support routing on the edge router. I am thinking it might be time to ask for another Class C to do the routing functions, and keep the firewalls all at Layer 2 in one /24 - Class C?
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Mar 15, 2011
I am getting ready to setup avtice/standby failover on our ASA 5520's and have run in to an issue.I currently only have one External IP address available. My Idea was to use a private/placeholder IP address for the standby external IP Address, will this cause any issues with the failover? I know I won't be able to access the secondary from the outside, but that is not an issue.
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Jul 28, 2012
i have used hierarchical addressing in my tcl program. when i run the code, it produces the error, str2addr:Address 146672855 outside range of address field length 1024. what's his error?
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Jun 4, 2012
how can enable addressing ipv6 in router linksys EA4500? I need access on the terminal of router?
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Apr 23, 2012
I need 10gigbit uplink for this switch. What are the other devices that i need order along with this device.And what is the diff between X2-10GB-LR= and CVR-X2-SFP.if i take CVR-X2-SFP, in future how can i upgrade from one gig to 10 gig?for current use i need 10gig support required. so what are all the other devices that i need to order.Fiber multimode and distance 15Mt only.
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Jun 28, 2012
I have a problem, i would like todo MACSEC betwwen two switches cisco catalyst 3560-x but I know that for this operation i needed ACS server 5.1 is it possible to encryp dataflow without ACS server and if you have the configuration
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Nov 2, 2011
i have an issue to connect a trunk between cisco switch and extreme switch i have many vlans that i want to cross via a link between cisco 3750 switch and a Extreme Alpine 3800 switch
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Dec 28, 2008
what is the use of no switch port command in L3 switch?
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Nov 18, 2012
I have two 3750-X configured to be a stack and I am planning to re-rack these somewhere else. What I would like to know is what are the effects of having the master switch itself lose power? Does it immediately just make the member take over master (there should be no election since there are only 2 switches??) and there would be no loss of connectivity?
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Nov 20, 2009
I have a Catalyst 4006 switch in production and a spare switch of same model. I have to quickly copy the configuration from production switch to spare switch (both L2 and L3 configurations) How do I do that?
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Apr 15, 2013
I have a 2 cisco switches that are at different sites one is a Cisco CAT4500 and other 3560. The connection between the switches is a layer 2 fibre link. CAT4500 and 3560 both have VLAN interface ip addresses in order for me to connect to the switches.
I have PC A connected to CAT4500 and PC B connecting to 3560. All these devices are the same VLAN and in the same subnet. I do have trunk links all the way though allowing this vlan as we run vlans. From PC A, I can ping CAT4500, 3560 and even PC B. This tells me everything is fine regarding Layer 2 & 3.
As soon as I move PC B and connect it to the other switch CAT4500 or move the other PC vice versa (this happens in both directions). Both switches learn that the mac address has moved locations and updates its mac address table accordingly. So when I do a show mac address table and show arp, everything has learned and moved fine. However when I try to ping any other device from PC B I cannot. So the 3560 switch PC B was originally connected to, I can no longer ping, the switch cannot see the pc also. It is as if PC B has not learned anything from the switch and cannot respond or reply to any icmp. I have tried this with different end devices, same thing. I am now thinking it has something to do with the switch.
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Jan 16, 2011
is it possible to assign a loopback address to a typical switch port on a 2950 switch? I want to be able to have some devices connected to a switch to test access lists and VLANs.
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Aug 12, 2011
can a poe switch be connected to an Ethernet switch
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Sep 8, 2012
what 'A DSL router is also a switch, albeit an unsophisticated one (usually).' mean.
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Dec 20, 2012
I have a 3560 here that doesn't seem to want to boot. What happens is plug the power in, SYS and RPS light go orange and the others are green for about .5 sec then all the lights go off and the SYS light flashes green 8 times and goes offThe fans on the switch are still running but no lights and no output to console.
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Apr 16, 2012
I am planning to put a switch in between ISP and Router.( WAN section)
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Mar 16, 2012
I have a 300 series switch with VLAN1 untagged, VLAN 15,5,100 tagged. I want say ports 1-12 to use one uplink/trunk and 13-24 to use another uplink. All ports should have the same default VLAN1 and be tagged for 5,15,100. I'm trying to ease the load on two wireless uplinks(one is a Cisco 1242AG and the other is a UBNT PowerBridge.) I don't want to add another switch. Model: SF 300-24P
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Apr 25, 2012
I know that a 1552 AP has 4 Ethernet ports. Is it possible to use them as some standard switch ports? If I connect two ore more devices to these ports do i have connectivity between them?
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Nov 10, 2012
I have a 3750 switch.The status of the switch is rommon," switch : ".there is not an IOS in the switch....Are there ways to install an IOS excepted xmodem
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Sep 28, 2011
We have installed last Network Assistant version, 5.6(3), but we can't add any switch to it.... It says always "Unsopported Device type: unknown".Our switches are all 2950, 2960 and 2970 models.
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May 14, 2012
I've added a number of switches to NCS and some of the switches had the wrong snmp communities, etc so weren't added as switches but instead were put under unknown devices.
I've corrected the information for each unknown device and am now seeing the following inventory status:1951799867 (IP: 10.243.26.22) will not have its features collected due to , device SPT_ONLY
They're still unknown devices and there seems to be no way to get them to show up as switches.I've tried to remove these devices but without success (despite a message appearing below the devices I tried to remove saying "Selected device(s) removed successfully.")
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Jun 8, 2012
i have Cisco L3 switch configured with diff vlan and assign diff subnet for all vlan . if i connect pc to vlan 2 i am able to ping host related to other vlan
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