UCS: switching/routing question

Hi,
I am trying to get a definitive answer to how switching and routing occurs in the UCS environment described below. I am also looking for a"primer" on the functions and overall process the IC plays in the UC.
We currently have 2x6120 conected to 6 chassis'. Most of them are ESX hosts with multiple VM's, each with VM's in different vlans. We are using the 1000v instead of the regular VDS. The IC's connect to a 7K with vlan SVI's. So, if there is a vm in vlan A that needs to communicate with a VM in vlan B, what is the route the data would take? Would they goto the 7K since that's where the SVI is or is the IC smart enough to make the switching decision?
Thanks in advance.

Hello Sudip,
Regarding introductions to the way the Fabric Interconnects work, check out the I/O Management section at the following page:
http://www.cisco.com/en/US/prod/ps10265/ucs_advantage_video_library.html
M. Sean McGee does a pretty good series on fundamental aspects of the UCS System.
By the way, the fabric interconnects are usually abbreviated as FI, not IC. This can help eliminate a little confusion when you talk to other UCS users. :-)
Regards,
Trevor
======================================================================================
If my answers have been helpful in any way, please rate accordingly. Thanks!

Similar Messages

6509 and 4948 Switch Routing Question

We have a 6509 switch in our core that handles routing between dozens of VLANs with it's MSFC. I'm connecting a remote Layer 3 4948 Switch to the 6509 via a Gigabit Fiber Link.
The 4948 will be connected to servers on a couple subnets as well as an alternate internet connection that I would like to have the 4948 route between locally but also send traffic to the VLAN's on the 6509. We are using EIGRP as our internal routing protocol.
The question I'm running into is whether I can setup a trunk link between the 6509 and the 4948, VTP, and setup EIGRP to route only using one of the trunk VLANs and between the local VLANs (with SVIs) and routed ports or would it be best to just setup a routed port to connect to one VLAN on the 6509.
The advantage I see if the trunk idea is feasible is that I can allocate certain ports to be access ports and go back to the 6509 to route and not be affected by local routing on the 4948. I absolutely do not want the 4948 to take over routing of my entire network as it will be on the edge and the 6509 is the core switch/router.
The advantage with using the 4948 connected to the 6509 as a routed port is that nothing on the 4948 will interface with the 6509 at Layer 2 and I can also keep VLAN's local to that switch. On the downside though this would prevent me from setting up VLAN's that span across the network connected to the 6509 or other areas of the network.
My other question is whether I should use the same EIGRP AS# on the 4948 so it interacts and shares routes with the 6509 or use a separate AS# to keep things isolated.
Any thoughts or ideas on these questions?

Thanks for the advice.
I would assume then I would simply assign one physical port on my 4948 with an IP address with the no switchport command and then set the ip address configuration rather than assign a SVI identical to the subnet connected to on the 6509?
Then could I create a new VLAN on the 4948 for the servers with an SVI to point my servers to as their default gateway. I could then use eigrp to get routes shared between the switches and across my network. I'm assuming I could just assign the physical port on the 6509 to one of my vlans as an access port (old 6509 CATOS so I don't have the "no switchport" configuration option).
Also, will it cause any problems if I have the same vlan setup on both switches (even though I'm not trunking them) as long as I don't use the same ip address space on each?
Does that sound about right?
Any other thoughts or suggestions?
Jim

Two quick VLAN routing questions

lets say I have a L3 switch routing 4 VLANs
VLAN 1 is 192.168.10.0/24, the switch's virtual interface is 192.168.10.254 inside this vlan
VLAN 2 is 192.168.20.0/24, the switch's virtual interface is 192.168.20.254 inside this vlan
VLAN 3 is 192.168.30.0/24, the switch's virtual interface is 192.168.30.254 inside this vlan
VLAN 4 is 192.168.40.0/24, the switch's virtual interface is 192.168.40.254 inside this vlan
there is only one router going out from this switch to the net, and lets say it is in VLAN 1 and it's address is 192.168.10.1
first question-- inside of the L3 switch I will need to add a default route of 0.0.0.0 0.0.0.0 192.168.10.1
so that all traffic not corresponding to a 192.168.x.x address knows where to get out to the net, correct?
secondly- when configuring that router, is there a difference if I use the following static route:
192.168.20.0 255.255.255.0 192.168.10.254
instead of
192.168.20.0 255.255.255.0 192.168.20.254
either way, the packet gets to the L3 switch, but in one case it gets there via the VLAN interface inside of VLAN 1, and in the other case, it gets there via the VLAN interface inside of the VLAN for which the traffic is destined anyway. what im trying to figure out is, will this make any difference at all? especially in terms of broadcast packets?
if it makes no difference, then is it safe to say that the following static route would be optimal?
192.168.0.0 255.255.0.0 192.168.10.254
Solved!
Go to Solution.

Re "firstly". Correct. The L3 switch will route traffic according to its routing table. By default it knows all IP subnets to which it is directly connected to, i.e. all the VLAN subnets. If you have to add a default route manually or not depends on the exact implementation. It may well be that the L3 switch will use the any default gateway for routing which you use for the IP settings of the switch itself (if there is an option in the web interface to set a default gateway). If you cannot define a default gateway on the L3 switch you probably have to add a static route manually. The easiest way should be to check the current routing table and see if there is a default gateway or not.
Re "secondly". A router can only forward packets to the next hop router. The next hop router must be connected to that router. The route "192.168.20.0 255.255.255.0 192.168.10.254" is correct for a router with IP address 192.168.10.1 and subnet mask 255.255.255.0 as 192.168.10.254 is connected to the router. "192.168.20.0 255.255.255.0 192.168.20.254" is not correct. The router cannot learn the path to a specific subnet 192.168.20.0/255.255.255.0 by using a gateway in that subnet. It is not correct to use that kind of a route and you should not use it even if it might even work (because the router does a plain ARP request to find the MAC address of 192.168.20.254 and your L3 switch will respond to the ARP request even if it is on the internet of 192.168.10.254). The very moment when there would be another router between the 10 and 20 subnets it would not work anymore...
Re your conclusion: I would recommend to keep four static routes for the existing subnets on the L3 switch instead of putting everything into a larger single subnet which includes a lot of addresses which are not connected there. Technically it works if you only use working IP addresses. But you will see some loops if you send something to 192.168.55.50 or similar. The gateway router will send it to the L3 switch which will send it back to the gateway. They should figure it's a loop but still I would not recommend this kind of setup... Add routes for each of the L3 switch subnet...

Is it same IOS version for Switch & Router?

Hi,
Is it same IOS version for Switch & Router?
Regards,
Samuel

Sam,
The Latest Version depends upon the Switching platform.
For example:
On 2900XL Platform - 12.0(5)WC15
On 2950 - 12.1(22)EA8
On 3500XL Platform - 12.0(5)WC15
On 3550 - 12.2(25)SEE2
It would be better if you specify the switch platform that you have questions about, so we could point you in the right direction.
I hope it helps.
Regards,
Arul

Is it possible to sort or filter the switch routes under the switching tab?

In Teststand 3.1, is it possible to filter the switch routes under the switching tab in Action Properties? Since I have a large amount of routes that have been created in Switch Executive, how can I filter out some of the routes from the "Routes to Connect" section?

The TestStand Switching does not provide any inherent filtering capabilities. You do have a couple of options, however.
(1) NI-Switch provides the ability to set up route connections in
different groups. The Switch Page in TestStand allows you to
select Routing groups as well as specific Routes. It may be
easier for you to organize your Connections as groups and choose
between different groups.
(2) The Property page also allows you to build route connection
string and use that string for your Switching actions. It
may be easier for you to build a Route string and easily change that
string rather than selecting your routes everytime from within the
TestStand window.
Good Luck!
Tyler T.
Applications Engineer
National Instruments

What's "SAVE" configuration command for Cisco switch/ router?

What's "SAVE" configuration command for Cisco switch / router? I know Switch#copy running-config startup-config works well,
but so long, any other command that easy to remenber?

What's "SAVE" configuration command for Cisco switch / router? I know Switch#copy running-config startup-config works well, but so long,
any other command that easy to remenber?
yes, here: Switch#write,and want to know more about the Cisco switch, please visit:http://www.3anetwork.com/cisco-switches-price_c1

Connect to WRT400N Router Wirelessly from Another Switch/Router?

My cable line, modem, and WRT400N router is in the basement and wired via cat5 to several other rooms in the house. The signal strength is great everywhere. Unfortunately, wiring was not run to the room where I need to connect (2) desktop PC's to the Internet. Can I use another router or switch to connect to the WRT400N router wirelessly so that those PC's will have Internet access via that device connection, or will I need to put wireless adapters in each machine that talk to the router in the basement directly?

Two linksys router will not communicate wirelessly...You can connect the switch/router hardwired to the router.

Cisco switch/router authentication

hi! is there anyway that i can authenticate user login thru Microsoft AD/IAS to the cisco switch/router without using Cisco ACS or any paid solution? Thx

Hello,
IOS configuration:
Switch(config)#radius-server host 192.168.250.20 key cisco123
Switch(config)#aaa authentication login default group radius local
Switch(config)#aaa authorization exec default group radius local
IAS configuration:
1) Define the RADIUS client entry:
2) Define the IAS Policies:

EEM scripting assistance: Switch, router and AP CDP

We would like to create an EEM script which will let the switch populate the interface description based on the CDP neighbour, however, we want the script to only populate the interface if (and only if) the CDP is a Cisco wireless access point (AP), a Cisco Catalyst switch and a Cisco router.   We DO NOT want the interface description to be edited if the CDP neighbour is a Cisco phone or a Cisco DMP (for example).
This is our EEM script:
event manager applet update-port
event none
event neighbor-discovery interface regexp GigabitEthernet.* cdp add
action 100 if $_nd_cdp_capabilities_string eq "Router" goto 200
action 110 elseif $_nd_cdp_capabilities_string eq "Switch" goto 200
action 120 if $_nd_cdp_capabilities_string eq "Switch" goto 200
action 200 cli command "enable"
action 210 cli command "config t"
action 220 cli command "interface $_nd_local_intf_name"
action 230 cli command "description $_nd_cdp_entry_name"
action 400 else
action 500 end
And this is a sample of our “sh cdp neighbor” output:
Switch#sh cdp n d
Device ID: Wireless
Entry address(es):
IP address: <REMOVED>
Platform: cisco AIR-CAP3602I-N-K9   , Capabilities: Router Trans-Bridge
Interface: GigabitEthernet0/8, Port ID (outgoing port): GigabitEthernet0.1
Holdtime : 146 sec
Version :
Cisco IOS Software, C3600 Software (AP3G2-K9W8-M), Version 15.2(2)JB, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2012 by Cisco Systems, Inc.
Compiled Mon 10-Dec-12 23:52 by prod_rel_team
advertisement version: 2
Duplex: full
Power drawn: 15.400 Watts
Power request id: 19701, Power management id: 2
Power request levels are:15400 0 0 0 0
Power Available TLV:
    Power request id: 0, Power management id: 0, Power available: 0, Power management level: 0
Management address(es):
Device ID: 00:0f:44:02:c5:29
Entry address(es):
IP address: <REMOVED>
Platform: Cisco DMP 4310G, Capabilities: Host
Interface: GigabitEthernet0/3, Port ID (outgoing port): eth0
Holdtime : 157 sec
Version :
5.4
advertisement version: 2
Duplex: full
Power Available TLV:
    Power request id: 0, Power management id: 0, Power available: 0, Power management level: 0
Management address(es):
Device ID: CALM040.mgmt.educ
Entry address(es):
IP address: <REMOVED>
Platform: cisco WS-C3750E-24PD, Capabilities: Switch IGMP
Interface: GigabitEthernet0/10, Port ID (outgoing port): GigabitEthernet1/0/22
Holdtime : 126 sec
Version :
Cisco IOS Software, C3750E Software (C3750E-UNIVERSALK9-M), Version 15.0(2)SE, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2012 by Cisco Systems, Inc.
Compiled Fri 27-Jul-12 23:26 by prod_rel_team
advertisement version: 2
Protocol Hello: OUI=0x00000C, Protocol ID=0x0112; payload len=27, value=00000000FFFFFFFF010221FF0000000000000023AC075300FF0000
VTP Management Domain: 'ACTEducation'
Native VLAN: 99
Duplex: full
Power Available TLV:
    Power request id: 0, Power management id: 1, Power available: 0, Power management level: -1
Management address(es):
IP address: <REMOVED>
Device ID: 00:0f:44:02:b6:31
Entry address(es):
IP address: <REMOVED>
Platform: Cisco DMP 4310G, Capabilities: Host
Interface: GigabitEthernet0/2, Port ID (outgoing port): eth0
Holdtime : 169 sec
Version :
5.4
advertisement version: 2
Duplex: full
Power Available TLV:
    Power request id: 0, Power management id: 0, Power available: 0, Power management level: 0
Management address(es):
Best Regards/Leo

action 221 regexp "^([^\.])\." $_nd_cdp_entry_name match hostaction 230 cli command "description $host"
Hi Joe,
So the EEM is going to look like this:
event manager applet update-port
event neighbor-discovery interface regexp GigabitEthernet.* cdp add
action 100 regexp "(Switch|Router)" $_nd_cdp_capabilities_string
action 110 if $_regexp_result eq 1
action 200 cli command "enable"
action 210 cli command "config t"
action 220 cli command "interface $_nd_local_intf_name"
action 230 regexp "^([^\.])\." $_nd_cdp_entry_name match host
action 240 cli command "description $host"
action 500 end
Is this correct?

1760 Router Questions

Essentially, I've been studying for the CCNA and I've decided to purchase some older equipment to set up in my house so I can get some additional practice with the IOS interface. I've been looking at 1760 routers on ebay, and it seems like a pretty good place to start as I would like to actually use the devices in my current LAN, rather than simply setting up a lab.
My question is, could I take a 1760 and connect it to my cable modem, and then connect a switch (say a 2950 that I'll purchase a later date) to another interface? What add-in cards will I need to make this possible?
Here's a graphic representation of what I'd like to do.
If the 1760 isn't a good choice for this sort of setup, what would you reccomend? I'd prefer 100Mbit/sec capable routers if possible.
Thanks for the help/suggestions.

Taylor,
if you have a VLAN capable switch and proper IOS support, you can configure PPPoE client on a subinterface hence you can use the 1760 (or any other router) to connect to the ISP and route between VLANs.
This is my current setup:
interface GigabitEthernet0/1
no ip address
duplex auto
speed auto
interface GigabitEthernet0/1.4
encapsulation dot1Q 4
ip pim dense-mode
ip igmp query-interval 125
pppoe enable group global
pppoe-client dial-pool-number 9
interface Dialer9
mtu 1490
bandwidth 4672
bandwidth receive 480
ip address negotiated
ip nat outside
ip virtual-reassembly in
encapsulation ppp
ip policy route-map RM-loop1
dialer pool 9
crypto map CM-1
crypto ipsec client ezvpn witopia_IAD
As you can see I use a subinterface to do PPPoE client and have the Dialer 9 interface receive the public IP address then I route traffic to other dubinterfaces. I used to do that on a 1751 nd on a 1721 this is now a 1921.
You need to ensure the pppoe client on 803.1q subinterfaces is supported in the ios version you run and obviously that 803.1q subinterfaces are supported.
You can do all of that in the cisco feature nav.
Enjoy
Fabio

Stacked SF500-24P and routing question

I'm looking for a stackable L3 switch which can do routing and with PoE and I think the SF500-24P is just right for me but have a question.
Is a stack of 2 of these switches seen as 1 device with 1 outside ip address per VLAN by devices that have this stack as the default gateway? or is something like VRRP active between the 2 stack switches and they both have their own ip address?
Thanks in advance,
Jasper

That is correct. The entire stack seen as one device. once the switches are stacked, there is no need for VRRP, HSRP, etc.. It is all one switch with one IP for management.
HTH

Simple Router Question (except not simple for me)

(Couldn't find another place for this question so I put it here.)
I have a router between my broadband modem and my Macs on the blink. I want to get a new one. I'm not asking for product recommendations as much as terminology clarification.
Again, I need a box that accepts my ethernet cable coming out of my broadband modem. I don't need wireless. It's simply going to allow me to offer ethernet cables out to Airport Express, iMac, etcetera.
What am I precisely looking for?
An ethernet router? Splitter? Does it need to have some sort of high bandwidth? The thing is I see these produces vaguely named and prices all over the place. A simple ethernet 'hub' strikes me as something very cheap ($20-30).
Any help truly appreciated.

Unless your broadband modem is "Also" a router, you need a router.
The Airport Express is a router, but it takes the ethernet cable and provides routing services for WiFi devices. It will not provide additional ethernet services for other devices.
You can NOT use an ethernet switch nor an ethernet hub.
While you can get ethernet only routers, the chances are that you will pay a premium over just getting a WiFi base station.
A WiFi base station is mostly a commodity items so they are often very inexpensive.
If you really do not need the WiFi services, many WiFi base stations allow you to turn off the WiFi.
Also note. If you are going to use the Airport Express to provide your WiFi, then you should configure it so it is in "Bridge" mode, otherwise you will have multiple isolated subnets where the devices on WiFi will not be able to properly see the devices on your ethernet. Putting the Airport Express in "Bridge" mode makes the WiFi network part of the same subnet that the ethernet devcies are on.

About to make the switch internet question

Hey,
I am just about to make the switch and get a Mac Pro and I have a question that needs answering. I have two Linksys routers a Wireless-G and a Wireless-N. I need to know if I will be able to use either of these routers with a Mac? What I wanna do is hook the mac up directly to the router (Wired) as the main computer on my network and have all my windows computers hooked up to the router on wireless. I wanna get this figured out before I spend that big of a chunk of money.
Thanks

Yes. A router is not platform specific (mac vs
windows). The only thing you won't be able to do is
upgrade the router's firmware, which requires a
windows machine.
You most certainly can upgrade the LinkSys firmware from OS X. It doesn't work with Safari, but you can use Firefox, SeaMonkey, or Netscape (possibly others, though I have not tried it with any others).
Mac Pro 2.66, 3 GB RAM Mac OS X (10.4.7)

UC500- Outbound SIP Routing Question

We have a UC540 that is receiving its trunking from a cloud based sip server. They have two trunks on the server, one for voice traffic and one for fax traffic. Inbound this works fine but all outbound traffic goes over the 'voice' trunk. Is it possible to route outbound traffic, from the fxs ports that the fax machines are connected to, onto the 'fax' trunk of the sip server? The sip server only provides one ip address, with unique registration to each trunk.

Hey guys,
Thanks for the response. Let me clarify my question a bit. I get the translation routing part and that is very helpful but I am still stuck on how to point a dial peer to the 'fax' trunk on the sip server.
A typical dial peer on the switch looks like this:
dial-peer voice 1022 voip
corlist outgoing call-national
description **CCA*Generic Locale*Long Distance**
translation-profile outgoing SIP-Trunk-Out
preference 1
destination-pattern 91[2-9]..[2-9]......
session protocol sipv2
session target sip-server
voice-class codec 1
voice-class sip dtmf-relay force rtp-nte
dtmf-relay rtp-nte
ip qos dscp cs5 media
ip qos dscp cs4 signaling
no vad
and the sip-ua looks like this:
sip-ua
credentials username 7xxxxx5 password xxxxx realm xxx.xxx.xxx.236 (voice trunk/user ID on the sip server)
credentials username 7xxxxx6 password xxxxx realm xxx.xxx.xxx.236 (fax trunk/user ID on the sip server)
keepalive target ipv4:xxx.xxx.xxx.236:5060
authentication username 7xxxxx5 password xxxxxx
no remote-party-id
retry invite 2
retry register 10
timers connect 100
timers keepalive active 100
registrar ipv4:xxx.xxx.xxx.236 expires 3600
sip-server ipv4:xxx.xxx.xxx.236:5060
connection-reuse
host-registrar
Thanks,
Chad

Looking to switch: router query.

Hi, i'm looking to switch broadband providers but i have a query first.
At the moment my wifi is provided by Apple Airport Express and Apple extenders and is linked to the router with ethernet cable. Does the BT router have an ethernet connection so i can still use the Apple wifi and if so will i be apple to turn off the BT wifi while i use this method.
Solved!
Go to Solution.

yes the home hub has 4 ethernet connections and you can turn wireless off if you wish
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UCS: switching/routing question

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