Cisco Switching/Routing :: 6500 - STP Mode MST To RSTP
Mar 20, 2012
I have a network with spanning-tree mode mst, but, we want change this for spanning-tree mode rstp. I have two cores(6500) and need know what is the better mode for change this with no impact in my network?
We dont have distributing layer, like a "topology" below.
ACCESS LAYER SWITCHES
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---------------------------------
|CORE1 ------ CORE2 |
--------------------------------
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SERVERS
CORE1 CONFIG
spanning-tree mode mst
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
spanning-tree uplinkfast
spanning-tree backbonefast(code)
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Oct 2, 2012
We have two 6500s. One is running in power redundant mode and the other is running in combined mode.We need to change the one running in combined mode to redundant mode to ensure it can run ok on one supply if needed but I have a couple of questions.
1. Assuming that we are not oversubscribed on the power allocated, does changing the mode cause any disruption?
2. The switch running in combined mode seems to have allocated some power for an "Inline Local-Pwr-Pool" which is not allocated on the switch running in redundant mode (see attached). Does this allocation will be needed if we change the power mode?
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Oct 14, 2012
We have two 6500 core switches and one(primary) of them is running in VTP transparesnt mode and the other (secondary) one is running in VTP client mode. I would like to change the VTP mode of the second switch to transparent mode. Would it cause any issue. I guess i have to create VLANs onto the switch.
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Apr 21, 2012
I have a very flat network. All of the gateways/SVI's exist on the same 6500. There are some vBrick IPTV servers that have a unicast address and 2-3 multicast addresses configured. After rebooting the 6500, the ip pim sparse-mode we had on all of our SVI's no longer work. I checked the old config and everything is the same as before I rebooted it. I troubleshot this for a while and found that the only way I can make this work now is if I enable ip sparse-dense on the SVI's. I believe this means that dense is the multicast method being used and I don't want to use dense mode because of all the flooding. How might I be able to make ip pim sparse-mode work again? I never had a static RP configured but I think I will need to. How do I decide on what ip address on the 6500 I should use as the RP? Should the ip address of the RP be a loopback address on the 6500 or should it be the SVI gateway ip of the vlan that the vBrick IPTV servers are on?
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May 18, 2012
The following discussion is based on cisco cat 6500 switches with two power supplies: p1 and p2. . Both power supplies are running in combined mode .Each power supplies is rated with 500 watts max( I just picked 500 watts for simplicity)Combined mode In combined mode, each power supply provides approximately 83% of its capacity to the chassis. This allows for greater utilization of the power supplies and potentially increased PoE densities
1) Let say our specific 6500 switch's configuration requires 1000 watts. We have two power supplies p1 and p2 ,each with rated power of 500 watts. Both power supplies must operate in combined mode. Will power supplies be able to meet the total load power requirement of 1000 watts?
Here is my understanding :The maximum power delivered by each power supplies is 83 percent of its rated power, assuming power supplies are running in combined mode.
So Maximum power delivered by power supplies
= 83% of p1+ 83% of p2
= 83% of 500 + 83% of 500
= 415 +415
=830 watts
Thus the required load of 1000 watts can not be met by our power supplies in combined mode.
2 )Suppose our switch's switch configuration needs 500 watts. Again our power supplies each rated with 500 watts, are configured for combined mode. How much power is being delivered by each power supply? Is it 83 percent of the total load i.e 500 watts?
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Apr 24, 2013
i have some ME-3600x. some of version 12.2 and one of version 15.5. te last one hast same config as all other. but if i check for rstp it sends.i know abount global config commands:
-spanning-tree mode rapid-pvst
-spanning-tree extend system-id
but there is no spanning-tree support. this causes many more problems. so it is important to solve spanning tee at first.is it possible without downgrading this device?
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Oct 30, 2008
When I plug in a workstation to 3750 switch - it seems to take about 35 seconds before that workstation (hard coded IP) can ping the switch. You can see the console messages below. I configured RSTP and set this switch to root:
spanning-tree mode rapid-pvst
spanning-tree extend system-id
spanning-tree vlan 22,33,44 priority 8192
[Code].....
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Nov 22, 2011
I have a 7609 with two LAG groups (Etherchannel not LACP) going to two separate devices that DO NOT participate in spanning-tree (Occam gear if you must know). I'm running 802.1w across the LAG groups but the convergence time is terrible! In essence, the 7609 is running spanning tree against itself (between the two blades). What can I do to fix my configuration?
If I disable the ports on the equipment connected to g1/17 & g1/18, it takes ~30 seconds for spanning tree to start forwarding on g2/17 & g2/18.When I bring the ports back up on the other side of g1/17 & g1/18 which are in a lag group, g2/17 & g2/18 immediately go into block mode while g1/17 & g1/18 start learning for another ~30 seconds!! [code]
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Aug 3, 2011
Configuring a network with Rapid Spanning Tree Protocol. There's a combination of Cisco 3650s, 2950 and 2960 switches. It is a flat Layer 2 network with a single VLAN. CLI configuration?
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Dec 26, 2011
What's wrong with my config? If I shutdown a port or pull a link it takes ~30 seconds to converge.
I have set spanning-tree portfast default on the 4948's. Is it proper to set my uplinks on these switches (g1/1) to shared or does that disable RSTP?
Switch 1 & 2 are 4948's running 12.2(54)
Switch 1 & 2 are connected on port 43
Switch 1 port 1 is connected to the 7609 12.2(33) SRD5 on port g1/2 Switch 2 port 1 is connected to the 7609 on port g2/2
I have a host on Switch 1 port 42 for testing.
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Feb 28, 2011
I have a 6500 chassis with 2 power supplies. At the moment I am using the default configuration:
power-redudancy mode redundant
The problem is that an inserted module is in "power deny" state due too insufficient power.
I know, that It's not a good idea to change into combined mode (loss of redundancy), but my customers requested this anyway.
So I will change to combined mode. So here's the 1 million dollar question: "Which modules will go into power deny, if one of my power supplies fails?"
The 6500 config guide states:
"Power supply is removed withredundancy disabled
• System log and syslog messages are generated.
• System power is decreased to the power capability of one supply.
• If there is not enough power for all previously powered-up modules, some modulesare powered down and marked as power-deny in the show power oper state field."
Well, do you know if there's any way to configure some kind of priority? E.g. I definetly don't want by 10Gig Module or WiSM module to be in power deny. Can i statically make sure, those module will be powered on for sure? Like: "power enable module slot_number" How is this calculated? Or is random?
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Dec 21, 2011
how can we upgrade 6500 non modular ios to normal 6500 ios?
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Feb 26, 2013
How can we know that 6500 and 7600 series switch and router are running in native mode or in hybrid mode.
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Mar 12, 2013
I received the following info from Cisco's TAC and wanted to inquire further before I start reconfiguring the switch:
In a redundant Sup-6E setup, the following configuration is supported :
- 1 TenGig uplink on Active Sup and 1 TenGig uplink on Standby Sup
- 1 TenGig uplink on Active Sup and 2 Gig uplinks on Standby Sup
- 2 Gig uplinks on Active Sup and 1 TenGig uplink on Standby Sup
- 2 Gig uplink on Active Sup and 2 Gig uplinks on Standby Sup
If you invoke shared backplane mode, the following configuration can also be supported:
- 2 TenGig uplinks(blocking) on Active Sup and 2 TenGig uplinks on Standby Sup
- 2 TenGig uplink(blocking) on Active Sup and 4 Gig uplinks on Standby Sup
- 4 Gig uplinks on Active Sup and 2 TenGig uplinks(blocking) on Standby Sup
- 4 Gig uplink on Active Sup and 4 Gig uplinks on Standby Sup
Here's the command and information about the "shared-backplane" mode :- [URL]
Currently, we have 2 SUP 6-Es(Module 5 - Active and Module 6 - Stand-by) setup in a redundent mode. I am planning on changing the redundent mode to the shared backplane mode so I can use 2 TenGig converters to uplink 2 access-switches. We purchased 2 TenGig converters and here is how I am planning on using them:
1- One will be used to uplink to two 3750 switches(stacked)
2- One will be used to uplink to a 2960 using a Gig SFP
My questions are:
1- Do I have to install the 2 TenGig converters(4-Gig Uplinks) in the same Module? Or can I use one one in module 5 and the second one in module 6?
2- Will changing the redundant mode to the shared backplane mode require rebooting the switch or disrupt the funtionality of the other linecards?
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Jan 21, 2012
As per my understanding 6509 all slots are dual channel, so 9 slot * 40 per slot (20 g in and 20 g out) = 360 GB How cisco claim the 720 ?? What about the 6513 chassic switch fabric connection?
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Sep 20, 2012
I am seeing a strange situation on my 6500 switch?By having snmp walk on '1.3.6.1.4.1.9.9.109.1.1.1.1.3' (== cpmCPUTotal5sec), I came to know that there are two processor and the cpu util for switching processor is gone to 88 % and some time creeps to 99 %.
snmpwalk -v2c -c "removes" sw6500 '1.3.6.1.4.1.9.9.109.1.1.1.1.3'
SNMPv2-SMI::enterprises.9.9.109.1.1.1.1.3.1 = Gauge32: 12 (--- this is for CPU of Router Processor )
SNMPv2-SMI::enterprises.9.9.109.1.1.1.1.3.3 = Gauge32: 99 (--- this is for CPU of Switching Processor )
but when I do sh process cpu on the console, all looks normal as it shows cpu utilization of RP. why the value is so high on the switching processor ?
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Jan 24, 2013
For intervlan routing, Is 'IP routing' command enabled by default on a 6500 series switches based on the IOS?and on 3750 switches, do we need to enable the "ip routing" command manually for intervlan routing?
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May 9, 2013
I'm looking to restrict Inter-VLAN routing through L3 switch (cisco 6500) and wanted to know best possible way to do it. I used VACL and achieved success to some extent, but my config is making clients take up to 5-6 mins to authenticate IP address from the DNS (bootps).My VACL config was as follows:
Subnet to restrict is 10.100.15.0 (VLAN 15)
STEP 1: Created extended ACL to allow bootpc/bootps through DNS
ip access-list extended EACL_DNS
permit udp any eq bootps any
permit udp any eq bootpc any
STEP 2: Created standard ACLs to allow only relevant subnet, server VLANs & some IPs from other subnets for printers/scanners etc.
ip access-list standard SACL_VLAN_15
permit 10.100.15.0 0.0.0.255 (the subnet I'm restricting)
permit 10.100.50.0 0.0.0.255 (server VLANs)
permit 10.100.25.45 0.0.0.0 (printer in another VLAN which has to have access in VLAN 15)
STEP 3: Created VLAN access list
vlan access-map VACL_15 10
match ip address EACL_DNS
action forward
vlan access-map VACL_15 20
match ip address SACL_15
action forward
STEP 4: Applying VLAN Access list on VLAN 15 vlan filter VACL_15 vlan-list 15 Though the above works, below is noted:
1. I'm still able to PING 10.100.15.2 (the switch virtual interface) from outside the subnet, which I don't intend to do so. Howeve all cients in the subnet have no connectivity from outside the VLAN 15.
2. As mentioned its taking quiet some time to negotiate with the DNS server at system boot time.
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Jun 2, 2012
I used to "ip routing" command in order to enable inter-vlan routing, for example with 3750 cisco. I have a 6503 cisco with SUP720 MSFC3. I was able to create some vlans but I can not configure inter-vlan routing.
sw#conf t
Enter configuration commands, one per line. End with CNTL/Z.
swsur(config)#ip routing
[Code]....
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Oct 30, 2011
For intervlan routing, Is 'IP routing' command enabled by default on a 6500 series switches based on the IOS?hes, do we need to enable the "ip routing" command manually for intervlan routing?
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Mar 16, 2013
Where is the "ip routing" command in Cisco switch 6500 series?
is the ip routing enable by default accoridng to the: [URL]
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Jul 17, 2011
In an IPSec port to DUT scenario, with Mode-Config set so as the DUT sends the IP address to the port, I get to a situation in which the DUT continuously enter the "Need config/address" state for the port, even if the port sends its ACK packet to every set IP address from the DUT.
The DUT is a Cisco 6500 Version 12.2 (33) SXI3, having Mode-Configuration configured to provide clients with IP addresses from a local pool. I enabled the "debug crypto isakmp" on Cisco, and below is an extract form the log file:
5d23h: ISAKMP:(80653):Need config/address /* My comments here: This is the first Address configuration message from Cisco to port */
5d23h: ISAKMP: set new node 1768971286 to CONF_ADDR
5d23h: ISAKMP: Sending private address: 94.94.0.164
5d23h: ISAKMP:(80653): initiating peer config to 171.159.1.113. ID = 1768971286
5d23h: ISAKMP:(80653): sending packet to 171.159.1.113 my_port 500 peer_port 500 (R) CONF_ADDR
5d23h: ISAKMP:(80653):Input = IKE_MESG_INTERNAL, IKE_PHASE1_COMPLETE
5d23h: ISAKMP:(80653):Old State = IKE_P1_COMPLETE New State = IKE_CONFIG_MODE_SET_SENT
above debug messages that Cisco produces I can not realize why Cisco resends the IP adderss configuration message for remote peer. Any other methods to use so as to get the reason behind this behavior? Or any explanation to the above behavior?
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Nov 25, 2011
i would like to check out what's the difference between the naming convnetion for the 6500 IOS.
I read the data sheet to support my POC deployment to support NCS v.1 the 6500 IOS need to upgrade to 12.2 (33) SXI
Is it able to work if i using SXJ instead of SXI, with the same IOS version 12.2 (33)?
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Jul 24, 2012
I have tried to test copy tftp: numerous time with no success. I believe the reason it is failing is my laptop to Ethernet port is in vlan 62 and the tftp process operates in a different IP space.I am using gig 7/1 and configuring my laptop nic for x.x.x.254 mask 255.255.255.0. I can ping from laptop to gateway) and I can ping from the switch to my laptop using ping vrf production x.x.x.254. Can you tell me what vlan I need to set my laptop connection in or if there is something else I need to change to make tftp work on vlan62?Does TFTP only work in vlan1 or can it be changed?
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Mar 25, 2012
how to upgrade IOS in switch 6500 connect in VSS from 12.2(33)SXI IOS to 12.2(33)SXJ?
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Jul 16, 2012
We are setup like a hotel style workers camp. We have wings full of rooms and residents with 3750 stacks in them. Those switches connect back to our core 6500's. The network is mostly all Layer 3, interfaces are routed with IPs.
When it was built before my time they included an ACL for each wing so that residents couldn't access internal devices (IE SSH to 6500) but I've come to notice it's not working.
I see hits on the ACL for accepts but nothing is hitting the deny rule at the top.Here is the configuration below:
mls qos aggregate-policer INTERNET1 24000000 80000 80000 conform-action transmit exceed-action drop
mls qos aggregate-policer INTERNET2 24000000 80000 80000 conform-action transmit exceed-action drop
mls qos aggregate-policer INTERNET 24000000 80000 80000 conform-action transmit exceed-action drop
[Code] ....
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May 6, 2013
On googling I came across documents that say OTV (Overlay Transport Virtualization) is supported on Cat 6500. Any authentic information whether OTV is supported on Cat 6500, especially with Sup-720B? FYI, Cisco Feature Navigator does not mention it.
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Mar 19, 2012
SUP2T-D#sh proce cpu hist
11111111111 1111 1111 1111 1111
0000000000099999000099999000099999999990000999900009999999
0000000000099999000099999000099999999990000999900009999999
100 **********************************************************
90 **********************************************************
80 **********************************************************
70 **********************************************************
60 **********************************************************
50 **********************************************************
40 **********************************************************
30 **********************************************************
20 **********************************************************
10 **********************************************************
0....5....1....1....2....2....3....3....4....4....5....5....
0 5 0 5 0 5 0 5 0 5
CPU% per second (last 60 seconds)
SUP2T-D#sh proce cpu sorted
CPU utilization for five seconds: 100%/83%; one minute: 99%; five minutes: 99%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
416 3324188 879928 3777 13.05% 14.42% 14.45% 0 Spanning Tree
633 104408 5091 20508 1.50% 0.53% 0.45% 0 Env Poll
75 22000 298 73825 1.10% 0.13% 0.07% 0 Per-minute Jobs
168 69696 163563 426 0.39% 0.23% 0.22% 0 slcp process
2 532 1010 526 0.07% 0.00% 0.00% 0 Load Meter (code )
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Feb 17, 2013
I am trying to guarantee 100mbps for a vlan across a gig link. I have done some research and found this command for switches
mls qos srr-queue input priority-queue 2 bandwidth 20
However it doesn't seem to work for my 6500. I know the 6500 uses PFC for QOS but I have no idea how it works. how I can guarantee a vlan 100mbps across a 1gig link?
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Jul 12, 2011
We are getting ready to start testing Quad VSS for our production VSS environments we have done the research and per documentation it seems pretty straight forward.
I want to make sure that the dual to quad VSS is easily done across our multiple VSS setups and I am curious of those that have done this already have you ran into any gotchas on the turn up of the ICS Sup?
Also, just a ICS in a single chassis instead of one in both chassis of the VSS?
In one of our environments we have all single home devices going to VSS switch 1 and only dual homed devices. going to switch 2 so may be desireable to only install an ICS in the switch 1 VSS.
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Aug 9, 2012
Cisco 6500 with 2T supervisor engine with following software Cisco IOS Software, s2t54 Software (s2t54-IPSERVICESK9-M), Version 15.0(1)SY1, RELEASE SOFTWARE (fc4)
The problem is that, I am not able to configure Multilayer Switching (MLS) (mls rp ip) in the global config command. Although the "mls" is visible on the config menu. but when I say "mls ?", the router prompt "unrecognize command"
Not sure if SUP 2T support MLS or it come with different name.
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May 21, 2012
I have WS-C6509-E chassis with VS-S2T-10G supervisor.
Currently I have IOS " S2TIBK9-15001SY - Cisco CAT6000-VS-S2T IOS IP BASE FULL ENCRYPT "
Can I upgrade the IOS to " S2TISK9-15001SY - Cisco CAT6000-VS-S2T IOS IP SERV FULL ENCRYPT " without purchasing this IOS?
Will I face issue in TAC cases?
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May 8, 2012
I have a question which i am unsure of, on the 6500 i know i can set mls qos trust to cos or dscp since I don't have any trunks configured on that switch that i want to trust cos most of my ports trust dscp instead. The question is will packets coming in or going out at L3 with the TOS bits set get placed in the correct in/out queue. For example if a packet comes in on a port with a mls qos trust dscp and has the TOS set to XX will this XX get mapped to the correct COS value based on the default dscp to cos map and end up going out the correct queue which handles that specific COS number?
I mainly asked this because i saw the following on the cisco site and again i am suing dscp trust and not cos.
Weighted Round Robin (WRR), Deficit Weighted Round Robin (DWRR) and Shaped Round Robin (SRR). WRED and all the Round Robin scheduling options use the priority tag (CoS) inside an Ethernet frame to provide enhanced buffer management and outbound scheduling.
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