Cisco :: Will QoS Info In When L2 Loop In Switches
Dec 27, 2012
All my switches were connected together as ring topology. We use REP to block redundancy link.One of my colleagure was setting up a new link(VLAN) for one customer which was then caused a L2 loop. The CPU was hitting 100% and REP started to lost neighbors then we had a big outage.I am thinking to deploy QoS on all REP switch (on trunk links from switch to switch) to give priority to control traffic like REP and some importance data VLAN. Of course,Storm-Control already implemented on all access-port.
I got an old WISE WS-4016 16-port 10/100Mbps Fast Ethernet Switch from a friend of mine which was not in use. However i am unable to find any information regarding this switch anywhere online.Unfortunately we couldn't find any manual for this switch as well.
We have a couple of cisco SGE switches connected to a single DELL, between the cisco switches we have a trunk interface. I'm not sure which setting should be configured on the switches to get it working because a loop is occuring.
I've got an SG300-10P switch and am trying to use it to create a testing environment for a Fiber Test set. What I would like to do is get two hosts, A & B, plugged into ports 1 and 3 on the switch, to talk to each other, but forcing the traffic to be routed through the two Combo ports 9 & 10. Please see the attached diagram.I've attempted to configure two VLAN's, 10 and 20. Vlan 10 is used for traffic between Ports 1 and 9, Vlan 20 is used for traffic between Ports 3 and 10.I don't really care whether the traffic is tagged or untagged as it passes between ports 9 and 10.
I've tried various combinations of tagged/untagged ports, PVID's, etc. As a first test I've bypassed the Fiber Test set and simply created a direct connection between ports 9 and 10. I am unable to get the traffic from Host A to Host B to get routed through ports 9 and 10 (I ping each host from the other and get no response).
So the SG300's have STP on them and prevent network loops when other switches on the network also support STP too. However, if someone plugs in a non-managed switch that doesn't support STP with a network loop, is there anything within the SG300 switches to isolate and/or prevent that from happening?
(I currently have port mirroring turned on for one port and a network sniffer attached awaiting the incident to happen again).
Signed onto pc as admin, logged into router with correct user name and password. No page in the browser based configuration displays the complete information for the page. Menus are missing as are option labels, etc. The last time I accessed the router (about a year ago) I didn't have this problem.
i have recently tried to change the catos on a Catalyst 2948G-L3 and since then i have the following message in a loop : [code] I know that the solution would be to download a new valid image from tftp via the common prompt but what i don't undertand is why i cant access the rommon prompt.
I have a bunch of 3750x switches that each have a 10 gig routed link back to a central 4507 (loopback = 172.30.255.255).We carved up a /24 (of course, the /24 doesn't really exist except in our address tracking spreadsheet) into a bunch of /30's for routed WAN links and /32's for loopback addresses.We started on the low end for /30 subnets (ie 172.30.255.0/30, 172.30.255.4/30, etc.).We started at the high end for the /32 loopbacks (ie 172.30.255.255/32, 172.30.255.254/32, etc.)
Well, when I try pinging 172.30.255.255 from the access layer 3750x switches, the 3750x seems to be treating it as a broadcast ping where it lists each member that responds instead of the regular !!!!! response (this makes think something is odd with the 3750x). Of course, only one member responds (the core). But even the core seems to respond with the other end of the /30 instead of the actual /32 loopback (which makes me think something is odd in the core). I could have sworn that I've setup similar topologies without problems (ie, using 10.0.0.0/32, 10.255.255.255/32, etc as loopbacks) and as long as the mask is a /32, it should work.Also, I can ping/ssh to that loopback if my laptop is on a directly connected subnet. But I can't do it from any of the 3750x switches (which are also directly connected).I've double checked for overlapping subnets, but nope. I don't see any. Routing looks fine. The actual /32 is being propagated everywhere properly.
I have a couple of 3560 switches running c3560-advipservicesk9-mz.122-44 and they are randomly experiencing the following:
- The switch locks up with no preceding error message in the log (I am forwarding syslog to Splunk).
- Upon reboot, the switch goes through the normal startup sequence with no error messages, then for some reason reloads the flash and starts all over again. (refer to doc)
This could happen after days or weeks. Sometimes they will go through two of these reloads on boot and be fine for awhile, and other times they will be stuck in the loop infinitely. I am using this same image with all of our 3560s, but am only having this issue with two of them.
We have a Cisco 3750G Core switch which has physical connections, each configured as trunks to two HP Access switches. The client who uses these access switches would like to put a link between the two, but this would create a loop.
Nowadays, people have smartphones, typically iPhones and Android phones, and they all have WiFi.We already have a wireless net set up, with 802.1x security, where people connect using certificates and user informations stored in AD..I would like to see the smartphones use the same SSID as the computers, using the owners user info from AD.But I think user info from AD only is too weak (since I cannot use certificate enrollment on the phones), so I would like to add the smartphone's mac address to the internal hosts database, too, so I have 2 layers of security:If smartphone mac exists in internal hosts, then authenticate it with AD information.When I try this, I only get the message that the user credentials does not exist in Internal users, and then it fails.
I have successfully set up a pptp vpn from my new rv220w. I have also successfully logged in using 2 seperate laptops and also my iPhone. They all work great. There is one issue. When connected and I log into the router it does not show these laptops or iPhone as being connected to the vpn. There is two spots that its supposed to show the page refreshes and shows nothing connected. Is there a setting I am missing?
I'd like to be able to have access to all the hard drives that are on both networks, with the aim of easy media sharing.Heres what i'm working with so far,I've got two networks each in a different apartment, each with internet access with a different provider.Network A has a wifi n duel band router, with two PS3s, two Xbox360s, two computers (one Macbookpro OSX and one PC win7 ) and one Wii all connected to the router wierlesly.Network B has a wifi, with PS2, Xbox360, a laptop win7 and a pc win7 I also have a portable hard drive, that i want to have access to wirelessly.'m not sure where to start, how to gain access to the other network without using the internet.I've been told that i'd have to get a server, but i'm not very computer lit, i just want the freedom of info over the two networks.
Device config is shown as follows in application doing the discovery. Cisco ASA 5520. [code] Is there any new updated agent available for Cisco ASA 5520 that contains the oid ".126.96.36.199.188.8.131.52.184.108.40.206.1.8 "
Iam fairly new to Cisco IOS and am having trouble getting an IPSEC tunnel to come up between 2 cisco 881-s. I have entered both debug crypto isakmp and debug crypto verbose but when I try to ping an internal IP at the other location through my VLAN1 interface no debugging info comes up.
Also my ACL-s for the crypto maps show no activity. I have tried many things so my configuration files are starting to get really messy.
I enabled dual stack on my rv042g router but its not recieving ipv6 information from my isp. My isp is Time Warner in Milwaukee. They assure me that they are ipv6 ready and assume the problem is on my end. All they want to do is have me connect one computer up to my modem. What good is that when I have a network that needs service. The router needs to be working not just one pc. My ipv4 is working perfectly. It is obtaining all information automaticly.
Is it possible to see device information for equipmnet that is logged into the AP541N access point? I was able to determine a specific IP address was eating a significant amount of bandwidth and was hoping to get the device information (name, type, etc) in the hopes of tracking down who it was.
I've got tons of fibre in my network. However, tbh, my knowledge about correct light levels isn't great. I generally wait until my router complains about a light level before I do anything. I would like to set up SNMP monitoring for light levels, but I need some kind of baseline.Anyone with extensive fibre experience? What light levels should I be looking at for both multimode and singlemode fibre?
Belkin router model FD305v1 no longer being provided any technical support by its Makers.You have to pay for it now. My router went out and first of all it's hard to find any information even on their own website. And if you do you still have to pay them to get it working again
I was setting a static IPs for my PCs, and for the Preferred and Alternate DNS Server addresses I looked on my router's Device Information page. It had "Primary DNS Server: 220.127.116.11", but "Secondary DNS Server:" is reported as "0.0.0.0". Router is a DIR-655:
I looked on my ISP's website and they have "18.104.22.168" listed as the Secondary Name Server/DNS:
Why does the router not report that? Is there something wrong? Should I still set 22.214.171.124 as the Alternate DNS Server in Windows?
EDIT: BTW, my modem reports both primary and secondary DNS servers on it's info page.
The rouge access points being detected by the 5508 WLC are not showing up on the Context Aware tab of NCS? I have a MSE 3310 installed and configured and it shows to be syncronizing with the WLC. I'm sure I am missing some part of the configuration just not sure where.
C1921, running version 15.1(4)M2, with licence for "IP base" feature set only.Trying to pass multicast via a PPTP VPN from a Windows XP machine to work around a non multicast-aware WAN link
1. With the IP Base feature set I am able to create a plain PPTP VPN without any encryption; the Windows XP machine can bring it up and unicast data passes through it OK in both directions.
2. But when trying to send multicast, only one-way traffic is observed:i. Windows XP host on far end of PPTP VPN and a local PC both running old Microsoft tool "MPING.EXE", sending and listening for traffic on the groiup 126.96.36.199i. The distant host receives and echoes back the packets received from the local machine + sending its own (confirmed with Wireshark running at the far end)ii. But the local machine directly connected to the C1921 router does not hear any packets from the far end; Wireshark shows only the ones it is sending.
3. Group status ("show ip igmp membership") as far as the C1921 is concerned shows both ends (192.168.50.10 (local end) and 192.168.50.201 (distant end via the PPTP VPN)) joined to the group [code]
4. But "show ip mroute" for that group shows an error; for the source on the far end of the PPTP VPN (having the IP address 192.168.50.201), the source interface is incorrectly shown as GigabitEthernet0/0 (should be Virtual-Access2.1 for that PPTP VPN) and the outgoing interface is shown as Virtual-Access2.1 [code]
5. I have tried adding static mroutes and messing about with parameters for the virtual-template interface for the PPTP VPN, but the problem remains. And if I put another local PC onto a different Ethernet port of the router, the multicast traffic does flow both ways - so the issue is solely with the PPTP VPN.After a week of head-scratching I am getting more and more convinced that it's a bug... but wonder if it is already-known, has a workaround, or a fix in newer firmware?