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Cisco Systems BC-23 manual

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Table of contents for the manual

  • Page 1

    BC-23 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Configuring Transparent Bridging The Cisco IOS softw are bridging fu nctionality combines the adv antages of a sp anning-tree bridg e and a full multiprotocol router . This combination pro vides the speed and protocol transparency of an ad apti ve spanning-tree bridge, al ong with the[...]

  • Page 2

    Configuring Transparent Bridg ing Technology Overview BC-24 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Transparent Bridging Features Cisco’ s transparent bridging softw are implementation has the fol lowing featu res: • Complies with the IEEE 802.1D standard. • Provides th e ability to logically se gment a transparently bridge[...]

  • Page 3

    Configuring Transparen t Bridging Technology Overview BC-25 Cisco IOS Bridging and IBM Networking Con figuration Guide Integr ated routing and bridging mak es it possible to route a specif ic protocol between routed int erfaces and bridge groups, or route a specific pro tocol between bridge groups. Local or unroutable traf fic can be bridged among [...]

  • Page 4

    Configuring Transparent Bridg ing Technology Overview BC-26 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Figur e 8 Brid ge-Gr oup Virt ual Interf ace in the Router The bridge-group virtu al interface is a normal routed i nterface that does not sup port bridging, b ut does represent its corresp onding bridge group to the routed in terf[...]

  • Page 5

    Configuring Transparen t Bridging Technology Overview BC-27 Cisco IOS Bridging and IBM Networking Con figuration Guide FDDI-bridged interface. But for I nternet Packet Exchange (I PX), Novel l-ether encapsulation from the bridge-group virt ual interface is translated to ra w-token or raw -FDDI when bridging IPX t o a T oken Ring- or FDDI-bridg ed i[...]

  • Page 6

    Configuring Transparent Bridg ing Transparent and SRT Bridging Config uration Task List BC-28 Cisco IOS Bridging and IBM Ne tworking Configuration Guide bridged netwo rk. T o tie in ex isting bridge s, you must use sour ce-route translational bridging (SR/TLB) instead. S R/TLB is described in the chapter “Conf iguring Source-Route Bridging. ” B[...]

  • Page 7

    Configuring Transparen t Bridging Transparent and SRT Bridging Con figuration Task List BC-29 Cisco IOS Bridging and IBM Networking Con figuration Guide Configuring Transparent Bridging and SRT Bridging T o conf igure transparent and SR T bridging, you must perform th e follo wing tasks: • Assigning a Bridge Gro up Number and Def ining the Spanni[...]

  • Page 8

    Configuring Transparent Bridg ing Transparent and SRT Bridging Config uration Task List BC-30 Cisco IOS Bridging and IBM Ne tworking Configuration Guide The purpose of placi ng network interf aces into a bridge group is tw ofold: • T o bridge all nonrouted traf fic among t he network interfaces maki ng up the bridge group. If the packet’ s dest[...]

  • Page 9

    Configuring Transparen t Bridging Transparent and SRT Bridging Con figuration Task List BC-31 Cisco IOS Bridging and IBM Networking Con figuration Guide The primary application of transpar ently bridged VLANs constructed in this w ay is to separate traff ic between bridge groups of l ocal network interfaces, t o multiplex br idged traff ic from sev[...]

  • Page 10

    Configuring Transparent Bridg ing Transparent and SRT Bridging Config uration Task List BC-32 Cisco IOS Bridging and IBM Ne tworking Configuration Guide T o conf igure a VLAN on a transparently bridg ed network, use t he followin g commands beginnin g in global conf iguration mode: T ransparently bridged VLANs are supported in conj unction with onl[...]

  • Page 11

    Configuring Transparen t Bridging Transparent and SRT Bridging Con figuration Task List BC-33 Cisco IOS Bridging and IBM Networking Con figuration Guide forwarding decision and only switch the traff ic to local interfaces configured as belonging to the same VLAN broadcast domain. Router A pro vides an inte r -VLAN mechanism that lets Router A funct[...]

  • Page 12

    Configuring Transparent Bridg ing Transparent and SRT Bridging Config uration Task List BC-34 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Configuring a Subscriber Bridge Group The Digital Subscriber Line (xD SL) bridge support feature enables you to configure a router for intelligent bridge fl ooding for xDSL and other bridge applica[...]

  • Page 13

    Configuring Transparen t Bridging Transparent and SRT Bridging Con figuration Task List BC-35 Cisco IOS Bridging and IBM Networking Con figuration Guide Support for RFC 1483 was added i n Cisco IOS Release 12.0(3)T , enabling transparent bridgin g between T oken Ring LA Ns (using AAL5-SN AP PVCs) and LANs, VLANs or ELANS (using bridged P DUs). RFC [...]

  • Page 14

    Configuring Transparent Bridg ing Transparent and SRT Bridging Config uration Task List BC-36 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Determining Access for Bridging Y ou can determine access b y either permitting all brid ge packets or b y controlling access according to Ethernet type codes. T o permit all transparent bridge pac[...]

  • Page 15

    Configuring Transparen t Bridging Transparent and SRT Bridging Con figuration Task List BC-37 Cisco IOS Bridging and IBM Networking Con figuration Guide Bridging in a Frame Relay Network with No Multicasts The Frame Relay bridging softw are uses the same spanning-tree al gorithm as the other bridg ing functions, b ut allows packets to b e encapsula[...]

  • Page 16

    Configuring Transparent Bridg ing Transparent and SRT Bridging Config uration Task List BC-38 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Configuring Transparent Bridging over SMDS W e support fast-swit ched transparent bridging for Switched Multime gabit Data Service (SMDS) encapsulate d serial and H SSI networks. Standard brid ging[...]

  • Page 17

    Configuring Transparen t Bridging Transparent and SRT Bridging Con figuration Task List BC-39 Cisco IOS Bridging and IBM Networking Con figuration Guide Configuring Concurrent Routing and Bridging Y ou can conf igure the Cisco IOS softw are to route a gi ven protocol amo ng one group of interfaces and concurrently bridge that p rotocol among a sepa[...]

  • Page 18

    Configuring Transparent Bridg ing Transparent and SRT Bridging Config uration Task List BC-40 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Assigning a Bridge Group Number and Defining t he Spanning-Tree Protocol Prior to conf iguring the router fo r integrated r outing and bridging , you must enable bridgin g by setting up a bridge gr[...]

  • Page 19

    Configuring Transparen t Bridging Transparent and SRT Bridging Con figuration Task List BC-41 Cisco IOS Bridging and IBM Networking Con figuration Guide When you enable routing for a gi ven protocol on the brid ge-group virtual interface, pack ets coming from a routed interface b ut destined fo r a host in a bridged domain are rou ted to the bridge[...]

  • Page 20

    Configuring Transparent Bridg ing Transparent and SRT Bridging Config uration Task List BC-42 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Note When a bridge group contains T oken Ring interfaces, the T oken Ring packets must not include RIF . The IEEE 802.1d tr ansparent bridge stan dard specif ies that frames with source routing inf[...]

  • Page 21

    Configuring Transparen t Bridging Transparent and SRT Bridging Con figuration Task List BC-43 Cisco IOS Bridging and IBM Networking Con figuration Guide All interfaces in the bridge gro up that are bridging IP should ha ve the same IP address. Ho we ver , if you hav e more than one bridge group, each bridge group should ha ve its own I P address. E[...]

  • Page 22

    Configuring Transparent Bridg ing Transparent and SRT Bridging Config uration Task List BC-44 Cisco IOS Bridging and IBM Ne tworking Configuration Guide T o reduce the amount of bandwidt h that LA T traf fic co nsumes on serial interfaces, yo u can specify a LA T -specific form of compression. Doing so applies compression to LA T frames being sent [...]

  • Page 23

    Configuring Transparen t Bridging Transparent and SRT Bridging Con figuration Task List BC-45 Cisco IOS Bridging and IBM Networking Con figuration Guide Preventing the Forwarding of Dy namically Determined Stations Normally , the system forwards any frames for stat i ons that it has learned about dynamically . By disabling this acti vity , the brid[...]

  • Page 24

    Configuring Transparent Bridg ing Transparent and SRT Bridging Config uration Task List BC-46 Cisco IOS Bridging and IBM Ne tworking Configuration Guide • Setting Filters at th e MA C Layer , page 46 • Filtering LA T Service Announcements, page 51 Note When setting up administrati ve f iltering, reme mber that there is virtually no performance [...]

  • Page 25

    Configuring Transparen t Bridging Transparent and SRT Bridging Con figuration Task List BC-47 Cisco IOS Bridging and IBM Networking Con figuration Guide Filtering by Specific MAC Address Y ou can filter frames with a particular MA C-layer stat ion source or destinatio n address. Any number of addresses can be configured into the system without a pe[...]

  • Page 26

    Configuring Transparent Bridg ing Transparent and SRT Bridging Config uration Task List BC-48 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Filtering by Protocol Type Y ou can f ilter by prot ocol type by using the acces s- list mechanism and specifying a protocol type code. T o filter b y protocol type, perform the f irst task and one[...]

  • Page 27

    Configuring Transparen t Bridging Transparent and SRT Bridging Con figuration Task List BC-49 Cisco IOS Bridging and IBM Networking Con figuration Guide T o filter t hese packets on input or outp ut, use either or both of the follow ing commands in interface config uration mode: Y ou can filter IEEE 802-encapsulated packets on input. The access lis[...]

  • Page 28

    Configuring Transparent Bridg ing Transparent and SRT Bridging Config uration Task List BC-50 Cisco IOS Bridging and IBM Ne tworking Configuration Guide After an access list is created initially , any subsequent additions (possibly enter ed from the terminal) are placed at the end of the list. In other words, you cannot se lecti vely add or remove [...]

  • Page 29

    Configuring Transparen t Bridging Transparent and SRT Bridging Con figuration Task List BC-51 Cisco IOS Bridging and IBM Networking Con figuration Guide Filtering LAT Service Announcements The bridging software al lows you to f ilter LA T frames. LA T bridge filtering allo ws the selective inclusion or e xclusion of LA T multi cast serv ice announc[...]

  • Page 30

    Configuring Transparent Bridg ing Transparent and SRT Bridging Config uration Task List BC-52 Cisco IOS Bridging and IBM Ne tworking Configuration Guide T o specify deny or permit conditions for LA T g roups on input, use one of the fo llowing commands in interface configuration mode: If a message specif ies group codes in both t he de ny and permi[...]

  • Page 31

    Configuring Transparen t Bridging Transparent and SRT Bridging Con figuration Task List BC-53 Cisco IOS Bridging and IBM Networking Con figuration Guide Note Only network administ rators with a good understanding of how br idges and the Spanning-T ree Protocol work should mak e adjustments to spanning-tree parameters. Poorly planned adjustment s to[...]

  • Page 32

    Configuring Transparent Bridg ing Transparent and SRT Bridging Config uration Task List BC-54 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Note Each bridge i n a spanni ng tree adop ts the in terv al between hello BPDUs, the forward delay interv al, and the maximum idle interv al parame ters of the root bridge, re gardless of what its[...]

  • Page 33

    Configuring Transparen t Bridging Transparent and SRT Bridging Con figuration Task List BC-55 Cisco IOS Bridging and IBM Networking Con figuration Guide Configuring Transparent and IRB Bridging on a PA-12E/2FE Ethernet Switch The P A-12E/2FE Ethernet switch por t adapter provides Cisco 7200 seri es routers with up to twe lve 10-Mbps and two 10/ 100[...]

  • Page 34

    Configuring Transparent Bridg ing Transparent and SRT Bridging Config uration Task List BC-56 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Note If you plan to use a P A-12E/2FE interface t o boot from a network (TFTP), ensure that the interface is configured for a loop-free en vironm ent, an IP address is configured for the interface?[...]

  • Page 35

    Configuring Transparen t Bridging Transparent and SRT Bridging Con figuration Task List BC-57 Cisco IOS Bridging and IBM Networking Con figuration Guide T o enable integ rated routing and bridg ing on the bridge groups, perf orm the follo wing tasks beginni ng in global conf iguration mod e: Monitoring and Maintaining the PA-12E/2FE Port Adapter Af[...]

  • Page 36

    Configuring Transparent Bridg ing Transparent and SRT Bridging Config uration Task List BC-58 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Configuring Bridge Groups Using th e 12E/2FE VLAN Configuration WebTool The 12E/2FE VLAN Conf iguration W ebT ool, sho wn in Figure 11, is a W eb brow ser-based Ja va applet that displays conf igur[...]

  • Page 37

    Configuring Transparen t Bridging Transparent and SRT Bridging Con figuration Task List BC-59 Cisco IOS Bridging and IBM Networking Con figuration Guide Figure 1 1 Example Home P age f or a Cisco 7200 Series Rout er (Cisco 72 06 Shown) Note Y ou must use a Java enabled W eb browser to access the 12E/2FE VL AN Configuration W ebT ool from your route[...]

  • Page 38

    Configuring Transparent Bridg ing Tuning the Transpar ently Bridged Network BC-60 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Note The VLAN Conf iguration W ebT ool hypertext li nk is listed in the router’ s home page only when a P A-12E/2FE port adapte r is installed in the router . Tuning the Transparently Bridged Network The fol[...]

  • Page 39

    Configuring Transparen t Bridging Tuning the Transparently Bridged Network BC-61 Cisco IOS Bridging and IBM Networking Con figuration Guide T o define a ci rcuit group, use the follo wing command in interface conf iguration mode: For circu it groups of mixed-b andwidth serial interf aces, it might be necessary to conf igure a pause interv al during[...]

  • Page 40

    Configuring Transparent Bridg ing Monitoring and Maintaining th e Transparen t Bridge Network BC-62 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Monitoring and Maintaining th e Transparent Bridge Network This section describes how to mo nitor and m aintain ac tivity on the brid ged network. Y ou can use one or more of the follo wing c[...]

  • Page 41

    Configuring Transparen t Bridging Transparent and SRT Brid gi ng Configuration Examp les BC-63 Cisco IOS Bridging and IBM Networking Con figuration Guide • Integr ated Routing and Bridging with Mu ltiple Bridge Groups Example, pag e 67 • T ransparently Bridged VLANs Confi guration Example, pag e 67 • Routing between VLAN s Configu ration Exam[...]

  • Page 42

    Configuring Transparent Bridg ing Transparent and SRT Bridging Config uration Examples BC-64 Cisco IOS Bridging and IBM Ne tworking Configuration Guide The configuration f ile for the rout er in Figure 12 is as follows: interface tokenring 0 ip address 131.108.1.1 255.255.255.0 bridge-group 1 ! interface fddi 0 ip address 131.108.2.1 255.255.255.0 [...]

  • Page 43

    Configuring Transparen t Bridging Transparent and SRT Brid gi ng Configuration Examp les BC-65 Cisco IOS Bridging and IBM Networking Con figuration Guide ! bridge crb bridge 1 protocol ieee bridge 1 route appletalk bridge 1 route ip ! Basic Integrated Routing and Bridging Example Figure 13 is an example of inte grated routing and b ridging that use[...]

  • Page 44

    Configuring Transparent Bridg ing Transparent and SRT Bridging Config uration Examples BC-66 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Complex Integrated Routing and Bridging Example Figure 14 is a more comple x example of inte grated routing and bridgin g, where bridge group 1 is used to route IP traf fic, bridge IPX traf fic, and[...]

  • Page 45

    Configuring Transparen t Bridging Transparent and SRT Brid gi ng Configuration Examp les BC-67 Cisco IOS Bridging and IBM Networking Con figuration Guide Integrated Routing and Bridging with Multiple Bridge Groups Example In the example il lustrated in Figure 15, inte grated routing and bridging is used to route and bridge IP between two bri dge gr[...]

  • Page 46

    Configuring Transparent Bridg ing Transparent and SRT Bridging Config uration Examples BC-68 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Router One bridge 18 protocol ieee interface ethernet 0/1 bridge-group 18 ! interface ethernet 0/2 bridge-group 18 ! interface ethernet 0/3 bridge-group 18 ! interface fddi 4/0.8 encapsulation sde 4[...]

  • Page 47

    Configuring Transparen t Bridging Transparent and SRT Brid gi ng Configuration Examp les BC-69 Cisco IOS Bridging and IBM Networking Con figuration Guide ! bridge 8 protocol ieee interface ethernet 1/1 bridge-group 8 ! interface ethernet 1/2 bridge-group 8 ! interface ethernet 1/3 bridge-group 8 ! interface ethernet 1/4 bridge-group 8 ! interface f[...]

  • Page 48

    Configuring Transparent Bridg ing Transparent and SRT Bridging Config uration Examples BC-70 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Routing between VLANs Configuration Example The follo wing example sho ws the configuration for the top ology sho wn in Figure 10. IP traff ic is routed to and from swit ched VLAN domains 300, 400, [...]

  • Page 49

    Configuring Transparen t Bridging Transparent and SRT Brid gi ng Configuration Examp les BC-71 Cisco IOS Bridging and IBM Networking Con figuration Guide If the other side of the FDDI ring w ere an FDDI interf ace running in encap sulation mode rather than in transparent mode, the f ollowing additional conf iguration commands wo uld be needed: inte[...]

  • Page 50

    Configuring Transparent Bridg ing Transparent and SRT Bridging Config uration Examples BC-72 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Router/Bridge in Building 2 The confi guration fi le for the router in Building 2 i s similar to Building 1: decnet address 3.56 ! interface ethernet 0 ip address 128.88.11.9 255.255.255.0 decnet co[...]

  • Page 51

    Configuring Transparen t Bridging Transparent and SRT Brid gi ng Configuration Examp les BC-73 Cisco IOS Bridging and IBM Networking Con figuration Guide Configuration for the New York City Router interface tokenring 0 ip address 150.136.1.1 255.255.255.128 bridge-group 1 ! interface ethernet 0 ip address 150.136.2.1 255.255.255.128 bridge-group 1 [...]

  • Page 52

    Configuring Transparent Bridg ing Transparent and SRT Bridging Config uration Examples BC-74 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Howe ver , the follo wing conf iguration might work initial ly but wi ll ev entually fail. The failure occu rs because the configuration does no t allo w for an ARP broadcast wi th a destination a d[...]

  • Page 53

    Configuring Transparen t Bridging Transparent and SRT Brid gi ng Configuration Examp les BC-75 Cisco IOS Bridging and IBM Networking Con figuration Guide Configuration for Bridge 3 interface serial 0 encapsulation x25 x25 address 31370019565 bridge-group 5 x25 map bridge 31370019027 broadcast x25 map bridge 31370019134 broadcast ! bridge 5 protocol[...]

  • Page 54

    Configuring Transparent Bridg ing Transparent and SRT Bridging Config uration Examples BC-76 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Configuration for Bridge 3 interface serial 0 encapsulation frame-relay bridge-group 5 frame-relay map bridge 27 broadcast frame-relay map bridge 134 broadcast ! bridge 5 protocol ieee Bridging in a[...]

  • Page 55

    Configuring Transparen t Bridging Transparent and SRT Brid gi ng Configuration Examp les BC-77 Cisco IOS Bridging and IBM Networking Con figuration Guide encapsulation lapb multi bridge-group 1 ! bridge 1 protocol ieee Fast-Switched Transparent Bridging over ATM Example (Cisco 7000) The follo wing conf iguration e xample enables fast -switched tran[...]

  • Page 56

    Configuring Transparent Bridg ing Transparent and SRT Bridging Config uration Examples BC-78 Cisco IOS Bridging and IBM Ne tworking Configuration Guide bridge-group 1 pulse-time 1 ! access-list 200 permit 0x0800 0xFFF8 ! dialer-list 1 protocol bridge list 200 bridge 1 protocol ieee bridge 1 hello 10 Fast-Switched Transparent Bridging over SMDS Exam[...]

  • Page 57

    Configuring Transparen t Bridging Transparent and SRT Brid gi ng Configuration Examp les BC-79 Cisco IOS Bridging and IBM Networking Con figuration Guide Figur e 21 Br idged Subnet w or ks with Domains For pro per bridging operat ion, the bridged subnetw orks cannot hav e connections between them , but the y can be connected to the same backbone . [...]

  • Page 58

    Configuring Transparent Bridg ing Transparent and SRT Bridging Config uration Examples BC-80 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Note T o get spanning-tree information b y bridge grou p, use the show span command. Included in this in formation is the r oot bridge of t he spanning tree. The root bridge fo r each spanning tree [...]

  • Page 59

    Configuring Transparen t Bridging Transparent and SRT Brid gi ng Configuration Examp les BC-81 Cisco IOS Bridging and IBM Networking Con figuration Guide Configuration for Router B Router B demonstrates a simp le bridge confi guratio n. It is co nnected to the FDDI backbon e and has domain 2 defi ned. As such it can bridge traf fic w ith the other [...]

  • Page 60

    Configuring Transparent Bridg ing Transparent and SRT Bridging Config uration Examples BC-82 Cisco IOS Bridging and IBM Ne tworking Configuration Guide interface serial 2 bridge-group 5 bridge-group 5 circuit-group 4 ! bridge 5 domain 3 bridge 5 protocol ieee Fast Ethernet Subscriber Po rt, Frame Relay Trunk Example The follo wing example uses the [...]

  • Page 61

    Configuring Transparen t Bridging Transparent and SRT Brid gi ng Configuration Examp les BC-83 Cisco IOS Bridging and IBM Networking Con figuration Guide int atm0 int atm0.1 point-to-point # # Use AAL5 SNAP encapsulation # atm pvc 1 0 101 aal5snap bridge-group 1 int atm0.2 # # Use AAL5 SNAP encapsulation # atm pvc 2 0 102 aal5snap bridge-group 1 # [...]

  • Page 62

    Configuring Transparent Bridg ing Transparent and SRT Bridging Config uration Examples BC-84 Cisco IOS Bridging and IBM Ne tworking Configuration Guide %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet3/1, changed state to up %LINK-3-UPDOWN: Interface FastEthernet3/1, changed state to up Router(config)# int ethernet 3/2 Router(config-if)[...]