From: Jack Heney (jheneyccie@xxxxxxxxxxx)
Date: Thu Nov 02 2000 - 19:47:59 GMT-3
You have multiple bridging options on the 3900...It breaks down like this...
The concentrator function (trcrf) is used to move traffic between ports in
the same ring (sort of like a MAU), but it uses 2 functions to handle this
movement. It uses transparent bridging, where it simply learns what MAC
addresses are attached to what ports in the trcrf, and source route
switching, where it uses the RIF information to make a forwarding decision
but doesn't modify it at all. So if all that is attached to the trcrf are
devices in that ring, transparent bridging works fine. But, if you have
another bridge plugged into a trcrf, the 3900 will need to use the RIF
information to learn what rings are attached to what ports, so the source
route switching functionality is used.
The bridging function (trbrf) is used to move traffic between ports in
different rings, and is much closer in functionality to an ethernet vlan
than the trcrf is. It defines the broadcast domain, and you must route to
get from one trbrf to another. The trbrf gives you two options as
well...source route bridging and source route transparent bridging. If you
want the trbrf to move traffic to or from a ring (trcrf) based on RIF
information only, configure the trcrf for source route bridging (this allows
the use of duplicate MAC addresses across different trcrf's). If you want
the trbrf to move traffic to or from a ring (trcrf) based on either RIF
information or MAC address, configure the trcrf for source route transparent
bridging (since MAC addresses are learned, all MAC addresses in the trbrf
must be unique if you use SRT).
This is my understanding of the functionality of token ring vlans, and if
anyone knows of any errors in the above, I would love to have my
understanding cleared up even further. I hope this helps.
Jack
>From: "Connary, Julie Ann" <jconnary@cisco.com>
>Reply-To: "Connary, Julie Ann" <jconnary@cisco.com>
>To: jconnary@cisco.com
>CC: "radha rani" <radhaccie@hotmail.com>, stiff.yu@datacraft-asia.com,
> ccielab@groupstudy.com
>Subject: Re: (actually SRB) - another question with a token ring switch
>3900
>Date: Thu, 02 Nov 2000 17:02:27 -0500
>
>Hi again,
>
>I've looked at this some more and it seems that on the 3900, the SRB is
>shown configured under the TrCRFs and not
>the TrBRF. So what is the use of the TrBRF? I guess I'll have to go back
>and read the document again. If anyone
>understands this - that would be great. Also, if that is true, then why
>when I had the Routers in the same TrCRF did
>I not need multiring ip configured if the TrCRF is setup for SRB? I'm
>assuming because they were
>then on the same ring?
>
>totally confused. I've just begun my bridging and DLSW studying - yuck is
>my first impression.
>
>Julie Ann
>
>
>At 04:04 PM 11/2/2000 -0500, Connary, Julie Ann wrote:
>>Hi,
>>
>>I thought that I was setting up exactly the same thing, but withh the 3900
>>as a token-ring switch with SRB:
>>
>>Both routers are running 11.2 code. The 3900 is running version 3 code.
>>
>>
>>R1 ------------------------------------------------------ 3900
>>------------------------------------------------------ R2
>> port 2 port 1
>> trcrf 12 trcrf 11
>> \trbrf 10/
>> ip addr 10.1.1.1
>> SRB
>>interface Tokenring 0 interface
>>tokenrin 0
>>ip addr 10.1.1.4 255.255.255.0 ip addr
>>10.1.1.5 255.255.255.0
>>multiring
>>all multiring
>>all
>>
>>
>>
>>I can ping from both R1 and R2 to 10.1.1.1 but cannot ping from R1 to R2.
>>I tried turning off ip routing, no effect.
>>
>>I understood from reading the token ring manuals that a TrBRF would Source
>>Route Bridge between two groups
>>of TrCRFs. When I configure R1 and R2 in the same TrCRF it works fine. I
>>wanted to test how
>>SRB works in a TrBRF.
>>
>>Any ideas on why this does not work? I thought that multiring all would
>>allow the R1 and R2 routers
>>to understand RIF's. But does that mean they act as end stations and send
>>out explorers? I see R1 or R2 sending
>>out arp requests out token 0 when I do the pings.
>>
>>Julie Ann
>>
>>
>>
>>
>>At 01:56 PM 11/1/2000 -0500, radha rani wrote:
>>>Okay, SRB is working now. Here's what I had to do:
>>>
>>>1. Disable ip routing on R4. Until I did that, R1 could not get a reply
>>>when it arp'd for R3's mac address. That's because R4 was routing ip and
>>>considered R1 & R3 to be on a common subnet so it did not reply via
>>>proxy-arp. Debug arp showed no reply to the arp request and a debug ip
>>>packets on R1 generated 'encapsulation failed' messages.
>>>
>>>2. Add 'multiring ip' on R1 & R3's TR interfaces
>>>
>>>3. Add 'multiring all' on both TR ints on R4 (although 'multiring ip'
>>>should also suffice since I only configured ip)
>>>
>>>4. Adding 'source-bridge ring-group xxx' globally in NOT necessary as R4
>>>is only a two-port bridge. (I did try it with this comand and it
>>>worked).
>>>
>>>Here are my working configs. I'm off to try RSRB next. Thanks for the
>>>help everyone.
>>>
>>>R1 (ip host):
>>>
>>>r1#sh run
>>>Building configuration...
>>>
>>>Current configuration:
>>>!
>>>version 11.2
>>>no service password-encryption
>>>no service udp-small-servers
>>>no service tcp-small-servers
>>>!
>>>hostname r1
>>>!
>>>!
>>>no ip routing
>>>no ip domain-lookup
>>>!
>>>interface Serial0
>>>no ip address
>>>no ip route-cache
>>>shutdown
>>>!
>>>interface Serial1
>>>no ip address
>>>no ip route-cache
>>>shutdown
>>>!
>>>interface TokenRing0
>>>ip address 10.10.1.1 255.255.255.0
>>>no ip route-cache
>>>ring-speed 16
>>>multiring ip
>>>!
>>>no ip classless
>>>!
>>>!
>>>line con 0
>>>line aux 0
>>>line vty 0 4
>>>login
>>>!
>>>end
>>>
>>>R4 (Source-Route-Bridge):
>>>
>>>r4#sh run
>>>Building configuration...
>>>
>>>Current configuration:
>>>!
>>>version 11.2
>>>no service password-encryption
>>>no service udp-small-servers
>>>no service tcp-small-servers
>>>!
>>>hostname r4
>>>!
>>>!
>>>no ip routing
>>>!
>>>interface Serial0
>>>no ip address
>>>no ip route-cache
>>>shutdown
>>>!
>>>interface Serial1
>>>no ip address
>>>no ip route-cache
>>>shutdown
>>>!
>>>interface TokenRing0
>>>no ip address
>>>no ip route-cache
>>>ring-speed 16
>>>multiring all
>>>source-bridge 100 1 300
>>>source-bridge spanning
>>>!
>>>interface TokenRing1
>>>no ip address
>>>no ip route-cache
>>>ring-speed 16
>>>multiring all
>>>source-bridge 300 1 100
>>>source-bridge spanning
>>>!
>>>no ip classless
>>>!
>>>!
>>>line con 0
>>>line aux 0
>>>line vty 0 4
>>>login
>>>!
>>>end
>>>
>>>
>>>R3 (ip host) :
>>>
>>>r3#sh run
>>>Building configuration...
>>>
>>>Current configuration:
>>>!
>>>version 11.2
>>>no service password-encryption
>>>no service udp-small-servers
>>>no service tcp-small-servers
>>>!
>>>hostname r3
>>>!
>>>!
>>>no ip routing
>>>!
>>>interface Ethernet0
>>>no ip address
>>>no ip route-cache
>>>shutdown
>>>!
>>>interface Serial0
>>>no ip address
>>>no ip route-cache
>>>shutdown
>>>!
>>>interface Serial1
>>>no ip address
>>>no ip route-cache
>>>shutdown
>>>!
>>>interface TokenRing0
>>>ip address 10.10.1.3 255.255.255.0
>>>no ip route-cache
>>>ring-speed 16
>>>multiring ip
>>>!
>>>no ip classless
>>>!
>>>!
>>>line con 0
>>>line aux 0
>>>line vty 0 4
>>>login
>>>!
>>>end
>>>
>>>r3#
>>>
>>>
>>>>From: "yujianchun" <stiff.yu@datacraft-asia.com>
>>>>Reply-To: "yujianchun" <stiff.yu@datacraft-asia.com>
>>>>To: "radha rani" <radhaccie@hotmail.com>, <ccielab@groupstudy.com>
>>>>Subject: Re:
>>>>Date: Wed, 1 Nov 2000 17:52:38 +0800
>>>>
>>>>can you tell result? I wait for you.
>>>>-----Original Message-----
>>>>From: radha rani <radhaccie@hotmail.com>
>>>>To: ccielab@groupstudy.com <ccielab@groupstudy.com>
>>>>Date: 28 October 2000 06:43
>>>>
>>>>
>>>> >Hello,
>>>> > I have a very simple SRB configuration which is not working. I
>>>> >would be very grateful if someone could shed some light on this.
>>>> >
>>>> >My topology is :
>>>> >
>>>> >r1 --- ring100---r4---ring300---r3
>>>> >
>>>> >r1 and r3 are acting as hosts and have ip addresses 10.10.1.1/24 and
>>>> >10.10.1.3/24 resp. r4 is the source-route-bridge. I am unable to
>>>>ping
>>>> >r1 and r3 from each other.
>>>> >
>>>> >Thanks for your help.
>>>> >
>>>> >R4's config is as follows:
>>>> >
>>>> >r4#sh run
>>>> >Building configuration...
>>>> >
>>>> >Current configuration:
>>>> >!
>>>> >version 11.2
>>>> >no service password-encrypt
>>>> >no service udp-small-server
>>>> >no service tcp-small-server
>>>> >!
>>>> >hostname r4
>>>> >!
>>>> >!
>>>> >!
>>>> >interface Serial0
>>>> >no ip address
>>>> >shutdown
>>>> >!
>>>> >interface Serial1
>>>> >no ip address
>>>> >shutdown
>>>> >!
>>>> >interface TokenRing0
>>>> >no ip address
>>>> >ring-speed 16
>>>> >source-bridge 100 1 300
>>>> >!
>>>> >interface TokenRing1
>>>> >no ip address
>>>> >ring-speed 16
>>>> >source-bridge 300 1 100
>>>> >!
>>>> >no ip classless
>>>> >!
>>>> >!
>>>> >line con 0
>>>> >line aux 0
>>>> >line vty 0 4
>>>> >login
>>>> >!
>>>> >end
>>>> >
>>>> >r4#
>>>> >
>>>> >-Radha
>>>> >
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 08:25:40 GMT-3