From: Jack Heney (jheneyccie@xxxxxxxxxxx)
Date: Fri Nov 03 2000 - 15:39:54 GMT-3
No....the switch will bridge traffic across the trbrf from one ring to
another...If you are trying to think in terms of ethernet vlans, a trbrf is
much more like an ethernet vlan than a trcrf is. You only need to route to
get from one trbrf to another.
hth,
Jack
>From: "radha rani" <radhaccie@hotmail.com>
>To: jheneyccie@hotmail.com, jconnary@cisco.com
>CC: stiff.yu@datacraft-asia.com, ccielab@groupstudy.com
>Subject: Re: (actually SRB) - another question with a token ring switch
>3900
>Date: Fri, 03 Nov 2000 10:04:43 EST
>
>Jack, Thanks for this explanation. I've been reading TR switching from the
>Catalyst 5000 config manual this morning and it is extremely confusing. I
>don't think i got it yet.
>
>Maybe you can answer this question:
>
>So if i have 2 trcrfs configured on the switch with one parent trbrf, and i
>need to connect a router to this switch to - say data link switch or RSRB
>traffic to a remote Token-ring lan, do I use two ports on the router - one
>on each trcrf hence placing each on a seperate ring? In that case i won't
>really use the trbrf for anything. The trbrf is used to bridge traffic
>between the rings in the absence of an external bridge - is that right?
>
>-Radha
>
>
>>From: "Jack Heney" <jheneyccie@hotmail.com>
>>Reply-To: "Jack Heney" <jheneyccie@hotmail.com>
>>To: jconnary@cisco.com
>>CC: 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 22:47:59 GMT
>>
>>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
>>>>>> >
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