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Multi-Service IronWare Routing Configuration Guide 277
53-1003033-02
Configuring IS-IS over a GRE IP tunnel
Configuration considerations
The configuration considerations are as follows:
• When a GRE tunnel is configured, you cannot configure the same routing protocol on the
tunnel through which the device learns the route to the tunnel destination. For example, if a
device learns the tunnel destination route through the OSPF protocol, you cannot configure the
OSPF protocol on the same Tunnel and vice-versa. When a tunnel has OSPF configured, the
device cannot learn the tunnel destination route through OSPF. This will cause the system to
become unstable.
• When you have keepalive configured on both sides of a GRE tunnel, we recommend that you
disable the tunnel before changing any tunnel configurations. You can then re-enable the
tunnel to restore it to normal functionality.
• When configuring a GRE IP Tunnel, the device must be configured with one of the following
CAM Profiles: ipv4, ipv6, mpls-l3vpn, ipv4-vpn, multi-service-2 or mpls-l3vpn-2.
Configuring IS-IS over a GRE IP tunnel
Figure 21 displays a network configured for IS-IS over a GRE IP tunnel. In the example, Brocade
IS-IS Router A and Brocade IS-IS Router B are configured for adjacency. Routers Brocade C and
Brocade D are configured with a GRE IP tunnel. Following the illustration are examples of the
configurations required for IS-IS over a GRE IP tunnel.
FIGURE 21 IS-IS over a GRE IP tunnel
The following examples describe the configurations that support IS-IS over a GRE IP tunnel for each
of the routers in Figure 21.
Brocade IS-IS Router A configuration
To configure Brocade IS-IS Router A for the IS-IS Point-to-Point feature use the following commands.
Brocade(config)# interface ethernet 2/1
Brocade(config-if-e10000-2/1)# ip router isis
Brocade(config-if-e10000-2/1)# ip address 10.10.1.2
Brocade(config-if-e10000-2/1)# isis point-to-point
- Multi-Service IronWare 1
- Document History 2
- Contents 3
- Chapter 3 IS-IS (IPv4) 9
- Chapter 4 RIP (IPv4) 10
- Chapter 6 MBGP 11
- Chapter 7 Multi-VRF 12
- Chapter 8 Inter-VRF Routing 12
- Chapter 9 Management VRF 13
- Chapter 11 IPv6 Addressing 15
- Chapter 12 IPv6 Prefix List 15
- Chapter 14 Static IPv6 Routes 16
- Chapter 15 BGP4+ (IPv6) 16
- Chapter 17 IS-IS (IPv6) 18
- Chapter 18 RIPng (IPv6) 20
- Chapter 20 VRRP and VRRP-E 21
- About This Document 23
- Supported software 24
- Document conventions 25
- Notice to the reader 26
- Related publications 26
- BGP (IPv4) 29
- Overview of BGP4 32
- BGP4 message types 35
- UPDATE message 36
- KEEPALIVE message 36
- Implementation of BGP4 37
- Memory considerations 37
- BGP4 Restart 38
- BGP4 neighbor local AS 40
- BGP4 null0 routing 41
- Configuring BGP4 42
- Enabling and disabling BGP4 46
- Multi-Exit Discriminators 48
- Redistributing IBGP routes 49
- BGP router reflector 49
- Configuring a route reflector 53
- Configuring confederations 54
- Enabling AS4 numbers 58
- AS4 notation 61
- BGP4 AS4 attribute errors 62
- • Logs an error 63
- BGP4 max-as error messages 64
- Originating the default route 66
- Setting the local AS number 70
- Configuring BGP4 neighbors 75
- Encryption example 82
- Configuring a BGP4 peer group 88
- Configuring a peer group 89
- Redistributing RIP routes 96
- Redistributing IS-IS 97
- Redistributing static routes 98
- Changing the device ID 99
- Adding a loopback interface 100
- BGP4 load sharing 101
- 53-1003033-02 102
- Support for RFC 4456 103
- Configuration procedures 103
- Filtering 104
- Special characters 105
- Using regular expressions 105
- Filtering communities 106
- Defining a community ACL 107
- Brocade(config)# router bgp 108
- Defining route maps 109
- Matching based on AS-path ACL 113
- Matching based on interface 115
- Dynamic route filter update 121
- Filter update delay and BGP 123
- BGP4 policy processing order 123
- • Configure the filter 124
- Sending and receiving ORFs 125
- Generating traps for BGP4 130
- Using soft reconfiguration 131
- Clearing traffic counters 137
- Removing route flap dampening 138
- Clearing diagnostic buffers 138
- Configuring BGP4 Restart 139
- Configuration steps 140
- Configuration examples 141
- Show commands 142
- Device 6 143
- Displaying BGP4 information 145
- BGP4 summary information 146
- This field... Displays 148
- Displaying route details 165
- Displaying AS4 details 171
- Field Description 172
- Attribute entries 177
- Extended community 177
- Running configuration 178
- BGP Routing Table is empty 182
- OSPF version 2 (IPv4) 183
- OSPF point-to-point links 186
- OSPF graceful restart 191
- • Summary (type 3 and type 4) 192
- • Opaque (type 10, TE link) 192
- Configuring OSPF 195
- Enable OSPF on the router 196
- Assign OSPF areas 197
- Assign a totally stubby area 198
- Brocade(config)# router ospf 199
- Example 201
- Modify interface defaults 203
- OSPF interface parameters 204
- Table 0.1: 206
- OSPF interfaces 207
- Assign virtual links 208
- Table 0.2: 210
- Define redistribution filters 213
- Enable route redistribution 215
- • Router ->R3 217
- • Router ->R4 217
- • Router ->R5 217
- • Router ->R6 217
- TABLE 19 Match Conditions 220
- OSPF non-stop routing 221
- Interface synchronization 222
- BFD with OSPF NSR 223
- Standby module operations 223
- Enabling and disabling NSR 224
- Limitations of NSR 224
- Adding additional parameters 224
- Disabling configuration 225
- OSPF distribute list 226
- Modify SPF timers 228
- (LSA) pacing 230
- Usage guidelines 231
- Modify OSPF traps generated 234
- Modify exit overflow interval 236
- Examples 240
- Command replacement 241
- Displaying OSPF information 242
- Syntax: show ip ospf config 243
- Syntax: show tasks 246
- • normal 247
- • 1 = point-to-point link 248
- This field Displays 250
- Displaying OSPF trap status 261
- This field Displays 262
- Clearing OSPF neighbors 264
- • Candidate 266
- • Elected 266
- Clearing OSPF information 267
- Commands 268
- Release Command History 269
- Output field Description 273
- IS-IS (IPv4) 275
- Domain and areas 278
- Neighbors and adjacencies 279
- Designated IS 279
- Broadcast pseudonode 280
- IS-IS CLI levels 281
- Interface level 282
- Enabling IS-IS globally 282
- • Change the default metric 283
- Setting the overload bit 284
- Configuring authentication 285
- • show isis database 288
- • show isis interface 288
- • show isis neighbor 288
- Brocade(config-isis-router)# 289
- Changing the SPF timer 291
- • ES hello (ESH PDU) 292
- • IS hello (ISH PDU) 292
- • IS to IS hello (IIH PDU) 292
- Logging adjacency changes 293
- Configuration considerations 294
- DIsabling 294
- Changing the metric style 295
- Configuring summary addresses 298
- ISIS Show command 300
- • Configure a GRE IP Tunnel 304
- Brocade C configuration 306
- Brocade D configuration 306
- IS-IS Non-Stop Routing 307
- Limitations 308
- Changing the hello interval 316
- Changing the hello multiplier 316
- DIS hello interval 316
- • Enabled – IS-IS is enabled 318
- Timers: L1 or L2 SPF: 319
- Timers: PSPF: 320
- Timers: LSP: 320
- Timers: SNP: 320
- Displaying the name mappings 322
- • LEVEL-1 326
- • LEVEL-2 326
- • LEVEL-1-2 326
- • Invalid checksum 328
- • Invalid length 328
- • Invalid lifetime value 328
- • Enabled 328
- • Disabled 328
- Displaying route information 329
- Displaying traffic statistics 334
- Displaying error statistics 335
- Displaying the IS-IS SPF Log 338
- Trigger types and description 339
- Clearing the IS-IS SPF Log 340
- Clearing IS-IS information 341
- RIP (IPv4) 343
- RIP parameters and defaults 344
- RIP interface parameters 345
- Configuring RIP parameters 346
- Configuring redistribution 347
- Setting RIP timers 352
- Displaying RIP Information 353
- Metric-offset, Outbound 0 354
- Policy-Based Routing (IPv4) 357
- Configuring a PBR policy 359
- Setting the next hop 360
- Enabling PBR 363
- LAG formation 367
- Show telemetry command 370
- (MBGP) features they support 373
- • Static IP multicast routes 374
- Configuring MBGP 375
- Enabling MBGP 376
- Adding MBGP neighbors 377
- Optional configuration tasks 378
- Displaying MBGP information 381
- Command Description 382
- Displaying MBGP neighbors 384
- Displaying MBGP routes 386
- Displaying dampened paths 388
- Displaying MBGP peer groups 391
- Clearing MBGP information 392
- Clearing BGP routes 393
- Multi-VRF 395
- Multi-VRF BGP or MPLS VPN 397
- MPLS Required No Yes 398
- Configuring Multi-VRF 400
- Configuration 1 402
- PE2 Configuration: 403
- CE 1 and CE 2 configurations 404
- Configuration 2 405
- PE1 configuration: 406
- PE2 configuration: 407
- CE 3 and CE 4 configurations 408
- Inter-VRF Routing 409
- Features & benefits 410
- Maximum route limitations 413
- Configuring Inter-VRF routing 413
- Clearing IP routes 419
- Modified CLI commands 420
- Management VRF 423
- SNMP server 424
- SNMP trap generator 424
- Telnet server 425
- SSH server 425
- Telnet client 425
- RADIUS client 426
- TACACS+ client 426
- Configuration notes 427
- Syntax: show vrf vrf-name 429
- Basic IPv6 Connectivity 433
- Enabling IPv6 routing 436
- FE48:4672/64 437
- IPv6 host support 439
- Supported protocols 446
- Restart global timers 446
- IPv6 Hitless OS upgrade 453
- Defining a DNS entry 455
- IPv6 Non-Stop Routing support 456
- ECMP load sharing for IPv6 457
- DHCP relay agent for IPv6 458
- Notification 460
- Notification information 462
- Configuring IPv6 ICMP 467
- IPv6 packets 469
- Neighbor redirect messages 473
- 1000 800 onlink autoconfig 475
- Changing the IPv6 MTU 484
- • Default IP MTU setting 485
- • Global MTU Setting 485
- • Interface MTU Setting 485
- QoS for IPv6 traffic 486
- Clearing the IPv6 cache 487
- • IPv6 prefix 488
- • IPv6 address 488
- • Interface type 488
- Using the nexthop option 498
- Displaying local IPv6 devices 500
- Advertisement Options 510
- IPv6 Addressing 515
- IPv6 address types 516
- TABLE 94 IPv6 address types 517
- IPv6 Prefix List 519
- IPv6 ND Prefix Suppress 521
- Managing a Device Over IPv6 525
- • Flash memory 526
- • Running configuration 526
- • Startup configuration 526
- Using the IPv6 ncopy command 528
- IPv6 TFTP server 529
- Using the IPv6 ping command 530
- Using Telnet 532
- Using Secure Shell 533
- Static IPv6 Routes 535
- BFD for Static Routes 538
- Single hop configuration 539
- Multi-hop configuration 539
- BGP4+ (IPv6) 541
- Configuring BGP4+ 543
- Adding BGP4+ neighbor 545
- Configuring a route map 546
- Creating a BGP4+ peer group 547
- Importing routes into BGP4+ 549
- Using route maps 551
- Enabling next-hop recursion 551
- Clearing BGP4+ information 553
- • Clear diagnostic buffers 554
- • Clear traffic counters 554
- Clearing BGP4+ VRF6 routes 558
- Displaying BGP4+ information 559
- Syntax: show ipv6 bgp config 568
- Displaying BGP4+ summary 598
- BGP4+ VPNv6 route information 606
- graceful restart 620
- • Restart Timer 621
- • Stale Routes Timer 621
- • Purge Timer 621
- OSPF version 3 (IPv6) 659
- OSPF Version 3 660
- Configuring OSPFv3 661
- Enabling OSPFv3 662
- Assigning OSPFv3 areas 662
- Specifying a network type 669
- Configuring virtual links 670
- Filtering OSPFv3 routes 677
- • 1 – Type 1 external route 680
- • 2 – Type 2 external route 681
- • Intra-area routes 682
- • Inter-area routes 682
- • External routes 682
- Brocade# configure terminal 684
- IPsec for OSPFv3 685
- Configuring IPsec for OSPFv3 686
- General considerations 687
- Configuring IPsec for an area 690
- Clearing IPsec statistics 693
- Configuring OSPFv3 NSR 694
- Displaying OSPFv3 information 696
- • BROADCAST 707
- • POINT TO POINT UNKNOWN 707
- • POINT TO POINT 707
- Syntax: show ipv6 ospf memory 709
- TABLE 143 OSPFv3 SPF table 717
- • DOWN – The link is down 720
- IPsec examples 721
- Showing IPsec policy 722
- Showing IPsec statistics 723
- Area configuration of IPsec 726
- OSPFv3 clear commands 731
- IS-IS (IPv6) 737
- Global configuration level 739
- Configuring IPv6 IS-IS 740
- Configuring summary prefixes 745
- IPv6 IS-IS Non-Stop Routing 751
- Configuring IS-IS NSR 752
- IPv6 IS-IS information fields 754
- • L1 – Level-1 route 769
- • L2 – Level-2 route 769
- IPv6 IS-IS Multi-Topology 770
- Migrating to IPv6 IS-IS MT 771
- Maintaining MT adjacencies 772
- New TLV attributes 772
- Enabling IPv6 IS-IS MT 772
- RIPng (IPv6) 777
- Configuring RIPng 778
- Configuring RIPng timers 779
- • IPv6 static routes 781
- • BGP4+ 781
- • IPv6 IS-IS 781
- • OSPFv3 781
- Displaying RIPng information 783
- Syntax: show ipv6 rip 784
- RIPng configuration fields 784
- RIPng routing table fields 786
- Policy-Based Routing (IPv6) 787
- Configuring the route map 789
- Enabling IPv6 PBR 792
- Displaying IPv6 ACL output 796
- ACL configuration 799
- Route-map configuration 799
- Apply route-map 799
- VRRP and VRRP-E 801
- Overview of VRRP 802
- Enhancements to VRRP 805
- Authentication 809
- Overview of VRRP-E 810
- Comparison of VRRP and VRRP-E 811
- VRRP and VRRP-E parameters 812
- ID of the virtual router 813
- Configuring the VRRP version 815
- Configuring a Backup for IPv4 817
- Configuring a Backup for IPv6 817
- Configuring IPv4 VRRP-E 818
- Configuring IPv6 VRRP-E 819
- Authentication type 821
- Hello interval 823
- Dead interval 823
- Track port 824
- Track priority 825
- Backup preempt 825
- VRRP-extended slow start 826
- VRRP-extended scale timer 827
- • “Displaying statistics” 828
- Displaying statistics 833
- VRRP example for IPv6 838
- Configuring router2 839
- VRRP-E example for IPv4 840
- VRRP-E example for IPv6 841
- Short path forwarding 844
- IP address 845
- IPv4 VRF support 845
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