Cisco Switching/Routing :: 3750 - Transition From Multicast Dense To Sparse Mode
Jun 19, 2012
A multisite network is currently supporting muticast using PIM dense mode, which is enabled on router/switch LAN and WAN interfaces across all locations. I am about to introduce Nexus switches to the main LAN. How can I make dense and sparse mode coexist to ensure flow of muticast traffic between devices supporting and dense and sparse mode? Eventually, I want to transition to the sparse mode; however, it has to be done gradually, even within a single site. The leacy equipment includes Cat 3750 and 4500s.
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Oct 23, 2011
What is PIM? give me an example when I will use and not use the PIM command.
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Feb 24, 2013
I think I have a good handle on PIM dense mode, but some of the output.I think Im actually just overthinking this but I want to validate. When I look at the output of a 'show ip mroute' what does the bolded line. [code] From what I understand, packets that arrive at the RPF interface are flooded through all other interfaces. But what does it mean when it says 'Prune' in that bolded line? Does that mean that the router is sending a prune out of that interface?
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Sep 23, 2012
I'm trying to configure "IP PIM SPARSE-MODE" command on a vlan interface on a 3560E switch but it doesn't give me the option to do this. The only option available is ip pim passive. What would cause this ? On the same switch a physical interface is already configured with IP PIM SPARSE-MODE.
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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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Dec 10, 2012
I have a subnet with a GPS clock on it that connects into a Cisco 3750. The 3750 has another subnet hanging off of it that connects into a firewall then to a server. I need the server to get time from the GPS clock. Any way to pass the NTP through the 3750? The 3750 has the 3750-IPBase code running on it so the multicast support is limited. I am under regulatory restrictions that only allow traffic to flow from the higher security level (were the time server is) to lower security level (were the server is). This prevents me from having the server go to the clock for updates.
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Feb 19, 2013
I try to pass multicast traffic between two vrf on the same 3750 switch. I have IP services IOS and sdm template routing.
here is my config:
ip routing
!
ip vrf vpn2
rd 1:1
mdt default 232.1.1.1
route-target export 1:1
route-target import 1:1
[code]....
Now I'm stuck - I don't know what to do to pass multicast traffic. Do I have any chance to run this config on 3750 chassis?Perhaps "Configuring Multicast VPN Extranet Support" document will be useful, but it concerns Catalyst 6500? [URL]
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May 12, 2013
I've been handed a requirement to try and get a multicast server working on my setup. Trouble is, I don't know if I can with the feature set I have on my switches. What is desired is that a multicast server (stand alone, but network connected, obviously) be accessible by everyone on the local network (multiple V LAN's, multiple SVI's) in the building.
All users will be connected to the one switch stack, although some will want to be wireless (which is one of the separate V LAN's) - I don't care if the wireless requirement goes by the wayside - they can sod off. :-) The main purpose will be multicast, high quality video.
I have a single switch stack consisting of two (soon to be 3) WS-C3750X-48P switches running the IP BASE feature set.
Question - can I do this on IP BASE, or do I need to upgrade to IP SERVICES?
If I can do it on IP BASE, does anyone have any links/pointers to setup this properly? Currently installed IOS is 12.2(58)SE2.
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Apr 16, 2013
I have PC_A and PC_B connected to the same switch, and are put in the same vlan. PC_A is the master (source) and PC_B is the destination (client). IGMP Snooping is enabled by default.
Is there any reason why this should fail? There is no RP or any interface with PIM enabled. Its a flat network with a source and client in the same vlan...
IH-3750-LOADTEST-101#show ip igmp snooping vlan 724
Global IGMP Snooping configuration:
-------------------------------------------
IGMP snooping : Enabled
[Code].....
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Mar 3, 2013
I have one server which run some application for wireless user. this server forward multicast packet to wireless user. server and wlc physically connect to cisco 3750 switch.i want the server forward the multicast packet to wireless users.server access vlan 4.wlc controller have 2 vlan: 90 and 110.and wireless user some of vlan 90 and some of vlan 110.i enable igmp snooping on wireless controller. and enable globally command but it is not working.which additional configuration i need on cisco switch.
Switch(config)# ip igmp snooping
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Nov 16, 2011
Im looking for some clarification regarding running a Cisco ASA in transparent mode with multiple contexts. To give you an insight into the network design we have the following -
Collapsed Core/Aggregation Layer running Cisco 3750s. The 2 Cisco 3750s are using SVIs with HSRP for default gateways per customer with a total of 8 customers. Each customer is segregated into seperate VLANs with Cisco 2960 switches used in the Access layer. Each customer has 2 Cisco 2960 switches with redundant uplinks to the Core/Aggregation layer. Customers are spanning tree loadbalanced between core/aggregation switches.
What i need to now do is add two transparent firewalls into the mix in either an active/active or active/standby setup. I need the firewalls to support all 8 customers, therefore I am guessing they need to run in multiple context mode. Having read into this it has left me somewhat confused as to how to integrate them into the above setup as a bump in the wire so to speak.
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Mar 5, 2012
I'm looking for switches that support single mode fiber connections and would like to know if "WS-C3750-FS-S Catalyst 3750 24 100BaseFX + 2 SFP" and "WS-C3750G-12S-S Catalyst 3750 12 SFP" can serve the purpose?
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Nov 15, 2012
What should the duplex mode to be set on a routed port gi0/21 that are running HSRP ? I try setting the gi0/21 to full, but it caused the port to be down. The only way for the port to be up is setting it to half duplex.
Cisco 3750 Switch
==============
interface GigabitEthernet0/21
no switchport
ip address 10.200.104.34 255.255.255.248
[Code].....
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Mar 23, 2013
Devices are 3750-24TS Switches, software version is 12.2(55)SE6. how to troubleshoot this issue, I have a pair of ports which are not bundling, no matter what. Is the same behavior with LACP or PAgP. In this outputs I have only the PAgP case.
Output is similar to:
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
12 Po12(SD) PAgP Fa1/0/23(I) Fa1/0/24(I)
Configuration on ports is simple:
SW1:
interface FastEthernet1/0/24
switchport trunk encapsulation dot1q
switchport mode trunk
channel-group 12 mode desirable
[code]....
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Jan 16, 2013
This is regarding VLAN creation on C3750E switch.I want to create new Vlan 94 on this switch and also I want to allowed same interfaces like Vlan 95 & Vlan 96. [code]
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Jun 4, 2012
I am troubleshooting a fiber connectivity issue.Now I have two switches, one is 3750, and another is small biz 300 series switch. Both switch has a single mode smf gbic. Now I have two swtiches face to face and connect with a single mode cable. Do you think if I would get a link light on? Both ports are no shutdown.
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Mar 12, 2012
clients ---asa--3750--cisco ace--- servers behind vip
|
visa card transaction servers
I am able to setup a vip on ace using routing mode on ACE,as the servers need to see the client ip ,so we are not performing SNAT,this part is working fine.
when a request comes from the client ,it goes to the vip and to one of the backend servers ,and the request will be forwaded back to the ace ,as the default gateway on the servers is pointing to the server vlan on ace.
but if the transaction from the servers need to go to the visa card transaction servers ,how can we acheive this ,and after fetching the data from visa servers,does the reply will be fwd to the ACE or ASAs directly.
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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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Mar 12, 2013
I start configuring Cisco 2821 router for multicast . First short description and attached sheme explanation. Let we say I have small network with 100 users. One router and Cisco switch 3560. Two VLAN’s, one for data another for multicast. Data from internet works fine but now I want to connect multicast servers (or source of more multicast streams) from another subnet. Router have three interfaces.I expect there should be no problems with multicast configuration, but unfortunately it is not like I expect. What I did ?
First step: enable multicast routing
Second step: on both interfaces (Fe 0/1 and Fe 0/2) - ip pim sparse-mode
Third step: configure switch that users are connected to access port in VLAN 222 (temporary to see if multicast work)
When I start VLC on computer nothing happend. If I try to connect computer on same subnet where is source of multicast streams it works fine.What I am doing wrong ? Is there anything about routing ? All subnets are directly connected. RP is not needed if I have one router or ?
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Mar 23, 2013
I need to enable multicast routing on 2960s but the command "ip multicast-routing" isn't available on my release (12.2.(55)).
From which release this command is available?
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Nov 14, 2012
I have a problem on my catalyst 6509 on which I would like to do the following things :
I have some Vlans in which multicast is enabled.
In tose Vlan theres is a router which is default router for equipements.
I had enabled multicast routing because some Vlan needs to exchange multicast informations, but I wolud like to make difference between Multicast traffic. For example I have 5 vlans:
Vlan 1 and 2 need to exchange Multicast informations but the don't need multicast information from Vlan 3 and 4
Vlan 3 and 5 need to exchange Multicast informations but the don't need multicast information from Vlan 1 and 2
Vlan 5 is independant Vlan but doesn't need to have multicast information from all others vlan.
Last problem, equipement on differents vlan can use the same Mulkticast group address. In this case, Multicast routing is not working between Vlan 1 to Vlan 2 and Vlan 3 to Vlan 4.
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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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Apr 29, 2012
I would like test multicast routing with cisco1801.i create 2 Vlan. Vlan 200 (192.168.200.x) affect Fastethernet 1, Vlan 130 (192.168.130.x) Fastethernet 5.
Version IOS is : adipservice-k9 124-9.t1
ip multicast-routing
#int Vlan 130
ip address 192.168.130.254 255.255.255.0
Ip pim dense-mode
#int Vlan 200
Ip address 192.168.200.254 255.255.255.0
Ip pim dense-mode
I used VLC for my test.When i connect source (224.10.10.10) and recever ( Udp://@224.10.10.10:1234), that's ok!But, source is on the Vlan 200 and reicever on the Vlan 130, is not good!I test with "sparse-mode", i have same problem.
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Feb 21, 2013
I’ve been trying a few days now to implement multicast routing on my home network in order to make airplay work between subnets. Specifically between an iphone and a hifi separated by different vlans. Failed, as I have no experience in multicast routing. we have a clean configuration and simple network which consists of two SVIs
Vlan 10: 192.168.1.0 255.255.255.0
Vlan 20: 192.168.2.0 255.255.255.0
ios platform cisco 887
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Jan 17, 2012
while i am configuring a port on switch .The switch reloads.After reload the show version says,System returned to ROM by bus error at PC 0x458F6C, address 0x0,show version from the effected switch is,Cisco IOS Software, C3750E Software (C3750E-UNIVERSALK9-M), Version 12.2(58)SE2, RELEASE SOFTWARE (fc1).
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Nov 14, 2011
I faced multicast routing problem - There is no multicast UDP stream toward host, although all igmp Joins/Reports/Leaves from the host are correct.
This is Cisco 7609 ip m route debug showing the situation:
369144: Nov 15 15:03:07.370 MSK: IGMP(0): Received v2 Report on Vlan176 from 10.XXX.XX.184 for 239.XXX.XX.46
369145: Nov 15 15:03:07.370 MSK: IGMP(0): Received Group record for group 239.XXX.XX.46, mode 2 from 10.XXX.XX.184 for 0 sources
[code]....
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Feb 7, 2013
I have an 861 that we are using for a test network and need to add static igmp addresses for multicast. We are using the router as a router on a stick with subinterfaces on the WAN link. I've looked everywhere to see how to add the static igmp addresses.
interface FastEthernet4
no ip address
no ip route-cache cef
[Code]....
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Jun 23, 2011
Facing a problem of double multicast on one of our cisco 3750 switch. On checking with sniffer it was found that out of double packet’s one packet is having source mac-address of vlan and another packet is having a source mac-address of switch base mac-address.
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Aug 30, 2012
We currently have ACE20's, which only support multicast in bridge mode.Was wondering if it's the same on ACE30's, or if Cisco finally implemented support for mcast in routed mode.
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Apr 25, 2012
i have an issue with a 2106 WLC. We have a 44xx series WLC and had an issue with Apple devices: they could not print from wireless. The workaround in the 44xx series WLC was that we have enabled Unicast in the Access Point Multicast mode (configued under Controller/General).
The issue now is that the 2106 wlc does not have unicast in AP multicast mode.
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Oct 28, 2012
I'm trying to configure multicast between 2 VLANs on a Cisco 886VA running IOS 15.2 (3) T1 (advanced security). While I can set the global "ip multicast-routing" I cannot "ip pim sparse-mode" on my interfaces - ip pim is actually unknown and also doesn't appear in the interface's ip subcommand list when using "?".
The feature navigator says pim is supported on my platform and IOS version.
My config looks like this:
interface FastEthernet3
switchport access vlan 103
no ip address
[Code].....
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Jan 31, 2012
I recently created a stack using (2) 3750x switches. I have three vlans on the stack (1,105,241) Vlan 105 is configured on 6509 core switches with multicasting and are connected to the stack via gigabit fiber. It is working well with clients on the Master or SW1, however clients on SW2 do not participate in multicasting Any client pc that is connected to SW2 vlan 105 does not show up in the "sh ip igmp snooping group" command. I can statically assign a client on SW2 to the mcast groups but but they fail to register on their own. I can take the cable connection from SW2 and plug it into an SW1 Vlan 105 port and it immediately becomes a member of the groups. I can then connect it back to the SW2 port and it disappears from the group membership. IGMP and PIM are configured with the defaults.
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Feb 18, 2013
I have a 3560X switch with interfaces 36-48 on the same LAN. All interfaces are switchports. Hosts on 38, 39 and 40 are multicast senders: all sending to the same single multicast address. Hosts on 36 and 37 are receivers, having joined that multicast group. I created an SVI for the LAN and put it in ip pim passive. (That is the only PIM mode allowed for an SVI with my IOS.) Show ip igmp snooping groups shows that 36 and 37 are the only interfaces in this group. I attach a laptop to interface 42 and Wireshark, and the laptop is receiving the multicast traffic. The laptop does not join the group. I expect it would not see the traffic.
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