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Cisco Switching/Routing :: Trunking With 4948 And 6506

Apr 23, 2012

We purchased two new 4948 with two 10GE uplink ports and upgraded the devices to run IOS 15.  My 6506 is running Sup 720 with s77233-adventerprisek0_wan-mz.122-33.SXI9.  Currently we have 4948's connected to the same 6506's with no problems.  Today I tried to add the new switches with new IOS and it caused of  of my 6506 core switches to failover.  I can't explain why because it was close to start of business and couldn't do much troubleshooting.

Currently we have four 4948 (running IOS 12.2(14)  switches running Layer2 connecting dually to each of the two 6506 cores via 10GE fiber uplinks.   I tried to add two more to the scenario, again running layer2 and dual-honing them to each of te 6506 switches.  there are two 6506 core switches and they run HSRP and spanning tree is manually set to give priority to even vlans on one 6506 and odds on the other 6506.  Also the new switches I tried to add did had rootguard applied as well as the uplinks.

We have to get this working and have no test environment to work with.  We need to do this late this evening after close of business.

On another note, I have had problems upgrading some of my older 4948's to IOS 15.  I followed Cisco's suggestion and upgraded the EPROM first and then the IOS upgrade took on three of the switches that were ordered rather recently.  The four that were ordered in one batch will not take the upgrade even following Cisco's instruction and lots of other tricks.  Nothing works. Having problems with IOS 15, in general?

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  6. Cisco Switching/Routing :: 4506 / 6506 - Multicast Routing
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Cisco Firewall :: 4948 ASA Trunking And Port-channel

Nov 20, 2012

Create a port channel out of interface 3 and 4 of ASAConfigure 2 sub-interfaces in those Po interface (my inside vlan and the dmz)At the 4948, configure a trunked port channel out of a single interface (funny ), then do the same in the second 4948Connect ASA port 3 to the 1st 4948's single-interfaced port channel, ASA port 4 connects the same on the 2nd 4948.

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Cisco Switching/Routing :: 3750 - L2 Trunking Versus L3 Switching

Dec 9, 2011

some of our switches have the switchport mode trunk command configured between the 3750 switches but other 3750 switches connected to our 6509 core switch do not have the switchport mode trunk command to permit Vlans from going across the swtiches instead it has an ip address and says no switchport what is the difference between does two. Is trunking used only for Layer 2 and L3 is used to route  interface vlans?

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Cisco Switching/Routing :: VTP Trunking On 2801

Feb 20, 2012

I am very new at this, but we have a 2801 router running 12.4, a 3560 that acts as the "Core" switch, and a bunch of remote 2960G's that connect via fiber to different buildings.

I am tasked to VLAN this network to reduce broadcast traffic. I started by setting up a VLAN 169 on the "3560" named the VTP domain, changed to version 2, and no password. THe Core switch and remote switch can share the VTP info, I HAD the Router seeing it too (able to ping 192.168.169.1) until I changed the "Domain" and "VTP Version"

The switches see each other fine, my problem is the Router sub interface 0/0.169 I cannot get to see the VTP domain. I imagine because I don't have a "Trunk port" set on the Router, but the option is not there. Meaning I cannot do a "switchport mode trunk" on it. The only thing I see is to make it:

TCRouter(config-subif)#encapsulation dot1Q 169 native

But, my "int fas 0/0" is used now as the main interface for our "only" network 192.168.0.0, do I need to turn this over to a subinterface and make it "Native" then the difference of the subinterfaces will advertise? Here is some of my conf:

Core SW:
TCCoreSW#sh vtp status
VTP Version : running VTP2
Configuration Revision: 8
Maximum VLANs supported locally : 1005
[Code]....

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Cisco Switching/Routing :: Trunking Avaya POE To 3750X

Apr 10, 2013

Attempting to trunk an Avaya POE switch to a Cisco 3750X switch. Here's the Cisco port config: [code]

 Cannot PING Avaya switch at 10.89.0.5. I have Cisco switches at .1,.2 and .3. I can PING those and access them. Any additional config needed on Cisco trunk port?

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Cisco Switching/Routing :: 3750 Stack And Trunking

Mar 5, 2012

I currently have 5 3750s connected via Stackwise. This stack is connected back to my core (6509s) via fiber (1Gig to Core1 & 1Gig to Core2). I want to move the 5th 3750 to another closet due to an addition of a new patch panel. Due to max length of 10 ft. for stackwise, my plan is to connect this 5th switch back to the stack using trunked fiber ports, with them being an etherchannel (2Gig). Also plan to use single fiber port form 2 different switches in the stack to provide some redundancy for the 5th switch. Should I be alert of any issues with this connection design? Do I need to properly remove the 5th switch from the stack using, no sw 5 provison sw-model or can I just disconnect stackwise and connect back with fiber?

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Cisco Switching/Routing :: 4506 / 6506 - Multicast Routing

Mar 8, 2013

I am configuring multicast in a environment where I have a 4506 at each site (4 total) and a 6506 as the core. Each 4506 is connected via layer 3 to the 6506. I have a mix of 3560s, 3548s, and 2960s connected to the 4506s and the 6506 via layer 2 trunk

I have multiple multicast sources and hosts communicating at a time (multiple cameras sending video / multiple computers receiving video).  So this is not a scenario where there is 1 sender and many receivers.  This would be many senders (~50) and some receivers (~10)

Sample Diagram:

->3560
|
6506 --> 4506 --> 3548
|   |
|    --> 2960
|
4506 --> 2960
|
-->3548

I configured ip multicast-routing on each of the 4506s and on the 6506. IGMP snooping is on by default on the 3560 and 2960 switches. CGMP is on by default on the 3548 switches.

I set up PIM sparse-dense mode and IGMP version 3 on each of the layer 3 interfaces for the 4506s and 6506 where they connect and on each VLAN that is sending or receiving multicast. Multicast is working throughout the network, however I am looking to verify the configuration as I scale this out to more clients on the network. 

#1 - Is it correct to us sparse-dense mode in this configuration?

#2 - Do I need to configure a rendezvous points using AUTO-RP? (ip pim send-rp-announce INTERFACE scope TTL). Not sure here if I need to designate this and what to choose.  Right now I do not have this and it is working, but documentation seems to infer that I need to designate this.

#3 - Is there any other configuration settings I should be considering?  I hard to find real world configurations of multicast as examples or people that know multicast routing well.

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Cisco Switching/Routing :: Bootvar With New IOS Name On 6506

Dec 20, 2012

I upgraded the IOS on 6506E, SUP 720-10GE, non-redundant, to a new one, rebooted OK. Switch seems to work fine but "show bootvar" shows the previous IOS name instead of the new one: s72033-advipservicesk9_wan-mz.122-33.SXJ3.bin.Removed the old IOS name on "boot var", gave it new IOS name, "show bootvar" now has correct new IOS name, write mem again and reloaded  switch.It booted up OK but "show bootvar" still has the old IOS:  "s72033-ipbasek9-mz.122-33.SXI2a.bin".According to IOS upgrade procedure, after all the upgrade IOS steps done, then just "write mem" then the "bootvar: will have the new IOS name, but on my switch it is always has the old IOS name ? How can I set the bootvar to new IOS name?

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Cisco Switching/Routing :: Cat 6506 Goes Into ROMmon

Nov 29, 2012

I have a Cat6506.  There were 2 Sup 720 in it for redundancy.  They told me they had problems with this thing in the past needing to go out and reboot the machine.  I need to go out periodically because it goes into ROMMON.  I type boot and it comes back up.  One time though neither one would reboot.  I had to take a third one out there and reconfigure it.  Now it is starting to do the same thing.  One thing I did notice is they never connected it to an UPS.  It is plugged strait into the wall with power going to two outlets.  I am beginning to think there are spikes in the power occurring and this is sending it into ROMMON. 

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Cisco Switching/Routing :: Which Connection Allows VSS - 6506

May 2, 2012

connection vss two 6506 which is the conector or speed (10g or1g) Sfp or x2 What is the connection that allows vss

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Cisco Switching/Routing :: 6506 - How To Apply ACL

Dec 7, 2011

Access-group only allows me to set the mode.access-group > mode > prefer > port > int g2/1,Those are the only options available to me, it doesn't allow me to go.ip access-group <name> in or out or access-group <name> in or out.

I realize the commands may be a little off, I don't have a switch nearby. When I get on our 3750 there are no issues, it allows you to apply the ACL the conventional way. I just can't seem to find any way to apply an ACL on an interface on the 6506 though.

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Cisco Switching/Routing :: Configuring 4507R For LACP And Trunking?

Apr 3, 2008

We're trying to configure our Cisco 4507 (Supervisor Engine IV) to allow a new Dell server with a pair of Broadcom 5708 GigE NIC's to aggregate its NIC's to give us a 2gbps link to the switch.

So far we seem to have got the team and LACP up and enabled, but the adaptor that the Broadcom Admin Util creates for the team is only showing a 1gbps connection where I would have expected it to show as 2gbps.

The individual NICs show as connected at 1gbps. We're not Cisco experts so are struggling on how to get the 2 NICs to aggregate.

On the server side we've done nothing other than create a team using 802.3ad LINk Aggregation using LACP.

This is what I think the relevent output from "sho conf" is, more available if needed.

version 12.2
boot system flash bootflash:cat4000-i9s-mz.122-18.EW1.bin
!
interface Port-channel2

[Code].....

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Cisco Switching/Routing :: Trunking Between 3500XL And 3Com 4800g

Oct 14, 2012

I am trying to trunk between a 3Com 4800g and a Cisco 3500xl.  I can get the a PC that connects to a vlan 1 port on thecisco switch to connect to the 3com switch and get connectivity.  However, I cannot get anthing on the cisco switch that is on vlan 2 to connect and get dhcp.  I am not a 3com guy, so I am not familiar with the command and configs.We have 2 vlans on both switches:  Vlan 1 is Admin and Vlan 2 is Student.

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Cisco Switching/Routing :: 2960 / Trunking Not Replicating Vlans?

Feb 8, 2012

I have two switches, a 2960 (sw01) and a 2948 (sw02). The sw01 is trunking via dot1q on Gi0/24 to sw02 on 2/48. Why are VLANs 2-4 not active on sw02?

sw01#sh int Gi0/24 trunk

Port        Mode         Encapsulation  Status        Native vlan
Gi0/24      auto         802.1q         trunking      1
 Port        Vlans allowed on trunk
Gi0/24      1-4094

[code].....

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Cisco Switching/Routing :: C2900 / Trunking Between Router And 2 Distribution?

Oct 20, 2012

Imagine I am designing  a small network with a C2900 router running OSPF and in the future BGP with service provider. Please see attached diagram.The router is connected to (2) C3750 Layer 3 distribution switches. Then one C3560 layer 2 switch to serve future IP phone users and desktops.

Question:

a)If I connect the router interface to the (2) 3750 switches, if I make the router interface fa0/0 and fa0/1 as a trunk to accomodate VLAN 200 and other future VLANs, don't I have a problem with overlapping networks between router interface fa0/0 and fa0/1? 

b)Alternatively, I could make the Router1 fa0/0 and fa0/1 configured with IP addresses and advertised in OSPF. Then the SW1 fa0/24 and and SW2 fa0/24 I could make as 'no switchport and create a routed interface port' with IP addresses, also running OSPF. Question is, from a scalable design perspectie, would you create 2 management networks and use those when assigning the IP addresses for Router1 fa0/1 and fa0/2? Because again Router1 fa0/1 and fa0/2 obviously need to be placed on different networks to avoid overlapping. So my question is more about proper network planning design to make this scalable to accomodate future VLANs in the future.Using trunks between the Router1 and SW1 option:

Router1
int fa0/0
   description connection to SW1
   no ip add
   int fa0/0.200

[code]....

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Cisco Switching/Routing :: 3560 CG Port Goes Down When Configuring Trunking

Jan 31, 2012

I have a 3560 8 port switch.  Int gi0/9 is trunked to another switch downstream.  When I try to configure int gi0/10 to trunk to a switch upstream the interface on the switch goes down and I have to either reboot the switch or plug directly into the switch and telnet into it to turn off trunking on the interface.  When I configure trunking on the interface on the upstream switch that connects to this interface the same happens on that switch.  The upstream switch is a 3750 with 12 sfp ports.  Several interfaces are trunking to other switches from this switch.  Spanning tree is not configured on the 3750 at all , and is not configured on either gi0/10 or gi0/9 on the 3560.  I was consoled into the 3560 during a reboot after the interface went down, a message came up that said something like "Spanning Tree returning gigabit ethernet 10 to constant state"  Why would I get this message if spanning tree is not enabled on the gig ports on either end of the trunk? There is no loop to require spanning tree to shut down an interface.  I have several other 3560's configured as I would like to configure this switch and they are trunking without issue. 

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Cisco Switching/Routing :: Trunking Between Catalyst 2950 Switches?

May 14, 2012

have setup a small lab as per CBTNuggets. Everything was going well until I introduced a second switch to create a trunk. Now I cannot ping between my two switches. Both show operational mode as down:

SWITCH1#show interfaces f0/12 switchport
Name: Fa0/12
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: down
Administrative Trunking Encapsulation: dot1q

[code]....

I have tried to allow all vlans or vlan 1 specifically and the output of the above doesn't seem to change. I am wondering if there is something in the config-register that is preventing trunking, but I don't really know enough yet!

The output of my second switch is identical to this one, the only difference is that I have it configured as a vtp client.

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Cisco Switching/Routing :: Trunking Between 3560 And IBM Blade 3012

Nov 18, 2012

Im having problems changing a connection between a Cisco3560 and Cisco IBM Blade switch 3012 actually the configuration is access in Cisco 3560 and trunk int Cisco 3012 when i change the connection to trunk i lose conecctivity to the servers connected in the 3012, i have changed the access from vlan 1 to the respective vlan in the access port of the servers

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Cisco Switching/Routing :: Trunking With HWIC-4ESW On 1921?

Feb 27, 2012

We have been facing a problem at my company ! We have a Cisco Router 1921 with one HWIC-4ESW in trunking with a RuggedCom switch RSG2100.When I use the GigabitEthernet port to make a trunk, I create 2 sub-interfaces (one for each Vlan) and configure the Port on Switch as Trunk, the inter-VLan routing works with no problem.But now I need to use this configuration using the HWIC-4ESW on Router, and I can't do this work. I try creat interface Vlan for each vlan, and try creating the VLans at Router Vlans database, but no way. At router I enter in interface and try to do the switchport trunk command to add a Vlan, but doesn't work.

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Cisco Switching/Routing :: 2960 / QoS Tagging And Dot1q Trunking?

Nov 9, 2011

If you have a router with multiple direct vanilla FE (non trunked) interfaces on a switch trying to send QOS tagged packets to a wifi bridge several switches away does the trunking in the switched infrastructure mess with the qos tags if no qos is configured on the switches.

Does it depend on the switch?  We have new 2960's running 12.2 and a few older 2950's running 12.1

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Cisco Switching/Routing :: Cannot Boot IOS On Switch 4948

Jul 14, 2012

I cannot boot IOS, when i reload this switch it go to ROMMON. I try to uploand IOS but it still has problem. i think i may wrong some point during i did uploand.

This is problem

Switch#sh bootvar
BOOT variable = cat4500-entservicesk9-mz.150-2.SG3.bin,1;bootflash:cat4500-entservicesk9-mz.150-2.SG3.bin,1;bootflash:cat4500-entservicesk9-

[Code].....

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Cisco Switching/Routing :: Getting Error In 4948 Switch

Mar 13, 2013

My cisco 4948 switch is generating the below error,how do i troubleshoot this error.

*Mar 13 00:09:33.451: %C4K_L2MAN-6-INVALIDSOURCEADDRESSPACKET: (Suppressed 14 times)Packet received with invalid source MAC addre ss (00:00:00:00:00:00) on port Gi1/37 in vlan 1Gi1/37- to this port another 2950 switch is connected by trunk link.and to this switch end host is connected i.e.thin client

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Cisco Switching/Routing :: 4948 Supported Stackable?

May 23, 2012

MAC Support: 16000
Backplane: 18Gbps
Forward: 28Gbps
VLAN's: 4000 (q-in-q support)
Jumbo Frame Supported
Supported 8000 static routing
!Supporting Stack!

Cisco 4948 supporting stackable? which product do you recommend to these criteria?

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Cisco Switching/Routing :: 4948 No Option For X-modem

Sep 19, 2012

I am updating the iOS for a 4948 the bootflash is empty so all i can get into is the rommon. There is no option for x-modem. How can I put the iOS onto this device? [code]

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Cisco Switching/Routing :: 4948 10GE Red Status LED?

Jun 5, 2013

We had to transport one of our 4948 10 GE to another Data Centre and when we got it there and tried to power up its System Status LED was red and we cannot even get console to the device.

We can try to see if the switch is completely dead and needs replacing or is there something we can do to get it back up and running again?

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Cisco Switching/Routing :: 4948 / 4500 - IOS Upgrade

Jul 25, 2012

I am planning to upgrade Cisco 4948 IOS upgrade. We have few with older code( 12.2(25)EWA7), when issue sh version shows as Catalyst 4000 L3 Switch Software. while newer version of the switch show as Catalyst 4500 L3 switch.

1 Is this/(sh ver output) just because of the Older code ? 
My 2 question is according to release note : [URL]

You need to upgrade your ROMMON before the IOS . 2 What is the approximate time it take to do this ROMMON upgrade ?

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Cisco Switching/Routing :: 4948 - Regarding IOS Image And Auto QoS

Mar 8, 2013

I have 4948E module switch at customer site and below is the show version output. Image on the switch is not supporting 'AUTO QoS' as i need to enable Auto Qos on it to prioritize Voice traffic. Which image supports Auto QoS feature . Image should have L3 functionality also i mean it should support Routing protocols. I tried to enable auto QoS using by configuring "QoS' globally but no luck...with existing image.

{ URL} 
ROM: 12.2(44r)SG9
Hobgoblin Revision 20, Fortooine Revision 1.22
Switch up time is 12 hours, 1 minute
System returned to ROM by reload
[ code]...

Configuration register is 0x2012
Switch#sh boot flash:
-#- --length-- -----date/time------ path
1     25793234 May 31 2011 15:20:20 cat4500e-entservicesk9-mz.122-54.SG.bin
2     25005209 Mar 08 2013 09:53:18 cat4500e-entservices-mz.122-54.SG1.bin

 70033408 bytes available (58249216 bytes used)

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Cisco Switching/Routing :: 6506-E Switch Always Boot With Old IOS

May 4, 2012

I tried to upgrade IOS from SXI2a to SXI9 in cat 6506 VSS. But the problem is that switch always boot with old IOS. I put the new IOS in sup-bootdisk and slave sup-bootdisk, bootvar is ok with new IOS: [code] Show bootvar  is ok but switch always boot with old IOS SXI2a, some bug in IOS sxi2a???, I will try to delete de old IOS from sup bootdisk and try with the new one only.

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Cisco Switching/Routing :: PAT Set Up Successfully On 6506 Chassis

Aug 30, 2012

I have PAT set up successfully on 6506 chassis - My outside address range is 78.24.112.114 255.255.255.240.Relevant parts of the config below: [code] This works fine but of course is only using the one IP address 78.24.112.114.how I can utilize the other outside addresses available or is this not really necessary? I've browsed through loads of Cisco docs.

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Cisco Switching/Routing :: DHCP Snooping On 6506

Mar 2, 2013

I have a problem with high CPU load by DHCP Snooping process on Catalyst 6506 (WS-SUP720-3B, soft: s72033-ipservices_wan-mz.122-18.SXF11.bin). I have it enabled on 15 VLANS, in which there are subscriber devices residing, and sending DHCP requests through Cisco to DHCP server (Cisco acts as DHCP relay, and it's collecting the snooping database, I also use DAI).

Snooping database contains 6962 bindings now.

CPU load goes high only sometimes, and I don't have a clue, why it's going so high. It can load as high as 45-47% of CPU, like this:

PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process
116    81471244 322596368        252 42.95% 43.48% 36.06%   0 DHCP Snooping 

When the load is high, the command: show ip dhcp snooping statistics is showing, that the overall quantity of
Packets Processed by DHCP Snooping is increasing rapidly. In normal situations, it's like 10-20 packets per second, but when the load is high, it's 1000-10000 pps.

But when I look at SPAN from my subscriber's VLANS, I don't really see any flood of DHCP requests, or something like that - everything looks as usual. Maybe, some of subscriber's devices are sending incorrect DHCP requests, that are causing packets to loop inside RP, or something like that? How can I detect that thing?

Also I thought, that if I enable the ip dhcp snooping trust mode on all of the Catalyst interfaces, the DHCP snooping will not process the subscribers DHCP packets, and I can, by exclusion of interfaces from one to one, detect, from which interface the problem is originating. But this seems to be incorrect, I turned the ip dhcsp snooping trust on all interfaces, and I still get spikes of CPU load by DHCP snooping process. Why it's still examining packets, even on trusted interfaces, is it ok?

And one more question - if I disable the ip dhcp snooping globally, will it clear all my existing bindings in snooping database?

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Cisco Switching/Routing :: C2924 Not Responding After Issuing Trunking Command

Apr 24, 2013

I've run into an issue with this type switch. I've a 2611xm router connected to a C2924-XL switch ((C2900XL-C3H2S-M), Version 12.0(5)WC17) Basically i configured the router as a RoTS with two sub interfaces setup with encapsulation dot1q.

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Cisco Switching/Routing :: How To Connect Two Switches 4505 Using Trunking Method

Dec 26, 2011

How Can i Connect two switches 4505 using the trunking method,…

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Cisco Switching/Routing :: Trunking Nexus 3048 With Force10 S4810

Apr 11, 2012

I have been assigned the task of trunking VLAN between a Nexus 3048 and a Force10 S4810. This would seem easy enough but I am really having a bear of a time getting it to work. I have devices configured on VLAN 602 on both sides but they just are not talking.

NX0S 3048
interface configuration
----------------------------------
interface Ethernet1/49
switchport mode trunk

[Code].....

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