From: Sam Munzani (sam@xxxxxxxxxxx)
Date: Fri Nov 03 2000 - 12:33:55 GMT-3
I don't know if I am right but here is my understanding of Cat3900.
1. If you need to put 2 ports under same ring. Create a TrBrf, TrCfr and put
both ports under that TrCrf.
2. If you need to create 2 seperate rings and bridge between them, One TrBrf
with 2 TrCrf and each port in different Crf.
3. If you want to isolate 2 rings totally from each other, create 2 TrBrf
and have Crfs and ports under each.
I know the language they used in document is hard to understand so I found a
CCIE friend and ask for "rule of thumb" for 3900.
Sam
> 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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