RP/0/RP0/CPU0:R1#show version Sat Sep 12 08:28:24.423 UTC Cisco IOS XR Software, Version 26.1.1 LNT Copyright (c) 2013-2026 by Cisco Systems, Inc. Build Information: Built By : cisco Built On : Thu Feb 26 03:41:18 UTC 2026 Build Host : iox-lnx-054 Workspace : /auto/srcarchive12/prod/26.1.1/xrd-control-plane/ws/ Version : 26.1.1 Label : 26.1.1 cisco XRd Control Plane cisco XRd-CP-C-01 processor with 248GB of memory R1 uptime is 34 minutes XRd Control Plane Container RP/0/RP0/CPU0:R1#show interface description Sat Sep 12 08:28:24.532 UTC Interface Status Protocol Description -------------------------------------------------------------------------------- Lo0 up up Nu0 up up Mg0/RP0/CPU0/0 up up management Gi0/0/0/0 up up to R2 (10.1.2.0/24 p2p) Gi0/0/0/1 up up to R3 (10.1.3.0/24 p2p) Gi0/0/0/2 admin-down admin-down RP/0/RP0/CPU0:R1#show route Sat Sep 12 08:28:24.720 UTC Codes: C - connected, S - static, R - RIP, B - BGP, (>) - Diversion path D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - ISIS, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, su - IS-IS summary null, * - candidate default U - per-user static route, o - ODR, L - local, G - DAGR, l - LISP A - access/subscriber, a - Application route M - mobile route, r - RPL, t - Traffic Engineering, (!) - FRR Backup path s - local SRv6 route, z - local IID route Gateway of last resort is not set L 1.1.1.1/32 is directly connected, 00:31:50, Loopback0 i L2 2.2.2.2/32 [115/10] via 10.1.2.2, 00:01:16, GigabitEthernet0/0/0/0 i L2 3.3.3.3/32 [115/20] via 10.1.3.3, 00:25:32, GigabitEthernet0/0/0/1 i L2 4.4.4.4/32 [115/30] via 10.1.3.3, 00:01:21, GigabitEthernet0/0/0/1 C 10.1.2.0/24 is directly connected, 00:31:43, GigabitEthernet0/0/0/0 L 10.1.2.1/32 is directly connected, 00:31:43, GigabitEthernet0/0/0/0 C 10.1.3.0/24 is directly connected, 00:31:43, GigabitEthernet0/0/0/1 L 10.1.3.1/32 is directly connected, 00:31:43, GigabitEthernet0/0/0/1 i L2 10.2.4.0/24 [115/20] via 10.1.2.2, 00:01:16, GigabitEthernet0/0/0/0 i L2 10.3.4.0/24 [115/30] via 10.1.3.3, 00:01:21, GigabitEthernet0/0/0/1 RP/0/RP0/CPU0:R1#show route isis Sat Sep 12 08:28:24.857 UTC i L2 2.2.2.2/32 [115/10] via 10.1.2.2, 00:01:17, GigabitEthernet0/0/0/0 i L2 3.3.3.3/32 [115/20] via 10.1.3.3, 00:25:33, GigabitEthernet0/0/0/1 i L2 4.4.4.4/32 [115/30] via 10.1.3.3, 00:01:21, GigabitEthernet0/0/0/1 i L2 10.2.4.0/24 [115/20] via 10.1.2.2, 00:01:17, GigabitEthernet0/0/0/0 i L2 10.3.4.0/24 [115/30] via 10.1.3.3, 00:01:21, GigabitEthernet0/0/0/1 RP/0/RP0/CPU0:R1#show route 1.1.1.1 Sat Sep 12 08:28:25.038 UTC Routing entry for 1.1.1.1/32 Known via "local", distance 0, metric 0 (connected) Installed Sep 12 07:56:34.758 for 00:31:50 Routing Descriptor Blocks directly connected, via Loopback0 Route metric is 0 Redist Advertisers: 3 (protoid=3, clientid=38) RP/0/RP0/CPU0:R1#show route 2.2.2.2 Sat Sep 12 08:28:25.187 UTC Routing entry for 2.2.2.2/32 Known via "isis 1", distance 115, metric 10, type level-2 Installed Sep 12 08:27:07.866 for 00:01:17 Routing Descriptor Blocks 10.1.2.2, from 2.2.2.2, via GigabitEthernet0/0/0/0 Route metric is 10 No advertising protos. RP/0/RP0/CPU0:R1#show isis Sat Sep 12 08:28:25.459 UTC IS-IS Router: 1 System Id: 0010.0100.1001 Hostname: R1 IS Levels: level-2-only Manual area address(es): 49.0001 Routing for area address(es): 49.0001 Multi-Instance Id: 0 Running on: RP/0/RP0/CPU0 Job Id: 1003 PID: 4386 Respawn count: 1 Started: Sat 2026 Sep 12 07:56:23.580 UTC Null0 ready: Sat 2026 Sep 12 07:56:25.155 UTC Protocol shutdown: No System memory state: Normal Last change: never Memory state: Normal Last change: never Last/Initial memory usage/limit: 1594831/2147483648 0% Memory state monitoring interval: 60 s Memory usage/limit: 13846451/2147483648 0% Memory usage specifics (count/bytes): Nodes: 4/1632 LSPs: 4/1674 Links: 8/9792 Prefixes: 12/11040 Nets: 8/5120 Paths: 14/1344 LSP MTU: 1492 LSP Full: level-1: No, level-2: No LSP fast flooding: Disabled Max LSP Tx: 1000 PSNP Delay: 500 ms PSNP interval: 50 ms Non-stop forwarding: Disabled Most recent startup mode: Cold Restart MFI LSD registered: No MFI LSD last registered: never TE connection status: Down TE connection up: never TE connection flaps: 0 XTC connection status: Down XTC connection up: never XTC connection flaps: 0 BFD connection status: Up BFD connection up: Sat 2026 Sep 12 07:56:26.062 UTC BFD connection flaps: 0 BFD HA role change: never BFD client HA role: none BFD server HA role: none Overload Bit: not configured Maximum Metric: not configured Topologies supported by IS-IS: IPv4 Unicast Rib connected Level-2 Metric style (generate/accept): Wide/Wide Metric: 10 No protocols redistributed Distance: 115 Advertise Passive Interface Prefixes Only: No Interfaces supported by IS-IS 1: Loopback0 is running passively (passive in configuration) GigabitEthernet0/0/0/0 is running actively (active in configuration) GigabitEthernet0/0/0/1 is running actively (active in configuration) RP/0/RP0/CPU0:R1#show isis hostname Sat Sep 12 08:28:25.581 UTC IS-IS 1 hostnames Level System ID Dynamic Hostname 2 * 0010.0100.1001 R1 2 0020.0200.2002 R2 2 0030.0300.3003 R3 2 0040.0400.4004 R4 RP/0/RP0/CPU0:R1#show isis interface brief Sat Sep 12 08:28:25.707 UTC IS-IS 1 Interfaces Interface All Adjs Adj Topos Adv Topos CLNS MTU Prio OK L1 L2 Run/Cfg Run/Cfg L1 L2 ----------------- --- --------- --------- --------- ---- ---- -------- Lo0 Yes - - 0/0 1/1 No - - - Gi0/0/0/0 Yes - 1 1/1 1/1 Up 1497 - - Gi0/0/0/1 Yes - 1 1/1 1/1 Up 1497 - - RP/0/RP0/CPU0:R1#show isis neighbors Sat Sep 12 08:28:25.814 UTC IS-IS 1 neighbors: System Id Interface SNPA State Holdtime Type IETF-NSF R2 Gi0/0/0/0 *PtoP* Up 24 L2 Capable R3 Gi0/0/0/1 *PtoP* Up 29 L2 Capable Total neighbor count: 2 RP/0/RP0/CPU0:R1#show isis database Sat Sep 12 08:28:25.945 UTC IS-IS 1 (Level-2) Link State Database LSPID LSP Seq Num LSP Checksum LSP Holdtime/Rcvd ATT/P/OL R1.00-00 * 0x00000009 0x1f63 1121 /* 0/0/0 R2.00-00 0x0000000b 0x3033 1119 /1200 0/0/1 R3.00-00 0x00000007 0xbc6d 675 /1200 0/0/0 R4.00-00 0x00000008 0xab64 1121 /1200 0/0/0 Total Level-2 LSP count: 4 Local Level-2 LSP count: 1 RP/0/RP0/CPU0:R1#show isis database detail Sat Sep 12 08:28:26.107 UTC IS-IS 1 (Level-2) Link State Database LSPID LSP Seq Num LSP Checksum LSP Holdtime/Rcvd ATT/P/OL R1.00-00 * 0x00000009 0x1f63 1121 /* 0/0/0 Area Address: 49.0001 LSP MTU: 1492 NLPID: 0xcc IP Address: 1.1.1.1 Hostname: R1 Metric: 10 IS-Extended R2.00 Metric: 20 IS-Extended R3.00 Metric: 0 IP-Extended 1.1.1.1/32 Metric: 10 IP-Extended 10.1.2.0/24 Metric: 20 IP-Extended 10.1.3.0/24 R2.00-00 0x0000000b 0x3033 1119 /1200 0/0/1 Area Address: 49.0001 LSP MTU: 1492 NLPID: 0xcc IP Address: 2.2.2.2 Hostname: R2 Metric: 10 IS-Extended R1.00 Metric: 10 IS-Extended R4.00 Metric: 0 IP-Extended 2.2.2.2/32 Metric: 10 IP-Extended 10.1.2.0/24 Metric: 10 IP-Extended 10.2.4.0/24 R3.00-00 0x00000007 0xbc6d 675 /1200 0/0/0 Area Address: 49.0001 LSP MTU: 1492 NLPID: 0xcc IP Address: 3.3.3.3 Hostname: R3 Metric: 20 IS-Extended R1.00 Metric: 10 IS-Extended R4.00 Metric: 0 IP-Extended 3.3.3.3/32 Metric: 20 IP-Extended 10.1.3.0/24 Metric: 10 IP-Extended 10.3.4.0/24 R4.00-00 0x00000008 0xab64 1121 /1200 0/0/0 Area Address: 49.0001 LSP MTU: 1492 NLPID: 0xcc IP Address: 4.4.4.4 Hostname: R4 Metric: 10 IS-Extended R2.00 Metric: 10 IS-Extended R3.00 Metric: 0 IP-Extended 4.4.4.4/32 Metric: 10 IP-Extended 10.2.4.0/24 Metric: 10 IP-Extended 10.3.4.0/24 Total Level-2 LSP count: 4 Local Level-2 LSP count: 1 RP/0/RP0/CPU0:R1#show isis topology Sat Sep 12 08:28:26.311 UTC IS-IS 1 paths to IPv4 Unicast (Level-2) routers System Id Metric Next-Hop Interface SNPA R1 -- R2 10 R2 Gi0/0/0/0 *PtoP* R3 20 R3 Gi0/0/0/1 *PtoP* R4 30 R3 Gi0/0/0/1 *PtoP* RP/0/RP0/CPU0:R1#show isis route Sat Sep 12 08:28:26.426 UTC IS-IS 1 IPv4 Unicast routes Codes: L1 - level 1, L2 - level 2, ia - interarea (leaked into level 1) df - level 1 default (closest attached router), su - summary null C - connected, S - static, R - RIP, B - BGP, O - OSPF E - EIGRP, A - access/subscriber, M - mobile, a - application i - IS-IS (redistributed from another instance) Maximum parallel path count: 8 C 1.1.1.1/32 is directly connected, Loopback0 L2 2.2.2.2/32 [10/115] via 10.1.2.2, GigabitEthernet0/0/0/0, R2, Weight: 0 L2 3.3.3.3/32 [20/115] via 10.1.3.3, GigabitEthernet0/0/0/1, R3, Weight: 0 L2 4.4.4.4/32 [30/115] via 10.1.3.3, GigabitEthernet0/0/0/1, R3, Weight: 0 C 10.1.2.0/24 is directly connected, GigabitEthernet0/0/0/0 C 10.1.3.0/24 is directly connected, GigabitEthernet0/0/0/1 L2 10.2.4.0/24 [20/115] via 10.1.2.2, GigabitEthernet0/0/0/0, R2, Weight: 0 L2 10.3.4.0/24 [30/115] via 10.1.3.3, GigabitEthernet0/0/0/1, R3, Weight: 0 RP/0/RP0/CPU0:R1#show isis adjacency-log Sat Sep 12 08:28:26.523 UTC IS-IS 1 Level 2 Adjacency Log Capacity: 100, Size: 6 When System Interface State Details --- Sat Sep 12 2026 --- 07:59:45.751 R2 Gi0/0/0/0 d -> i 07:59:46.359 R2 Gi0/0/0/0 i -> u New adjacency IPv4 Unicast Up 08:02:47.742 R3 Gi0/0/0/1 d -> i 08:02:48.141 R3 Gi0/0/0/1 i -> u New adjacency IPv4 Unicast Up 08:27:03.443 R2 Gi0/0/0/0 u -> i 3-way state down IPv4 Unicast Down 08:27:04.058 R2 Gi0/0/0/0 i -> u Restarted IPv4 Unicast Up RP/0/RP0/CPU0:R1#show isis spf-log Sat Sep 12 08:28:26.639 UTC IS-IS 1 Level 2 IPv4 Unicast Route Calculation Log Capacity: 210, Size: 17 Time Total Trig. Timestamp Type (ms) Nodes Count First Trigger LSP Triggers ------------ ----- ----- ----- ----- -------------------- ---------------------- --- Sat Sep 12 2026 --- 07:56:26.465 FSPF 0 0 2 CONFIG 07:56:36.256 FSPF 0 1 7 R1.00-00 CONFIG NEWNODE NEWLSP OVLSET PREFIXGOOD AREAADDR IPADDR 07:56:38.453 FSPF 0 1 1 R1.00-00 OVLCLR 07:56:43.418 PRC 0 1 1 R1.00-00 PREFIXGOOD 07:59:47.718 FSPF 0 2 5 R2.00-00 NEWNODE NEWLSP PREFIXGOOD AREAADDR IPADDR 07:59:50.086 FSPF 0 2 1 R1.00-00 LINKGOOD 07:59:50.487 FSPF 2 2 1 R2.00-00 LINKGOOD 08:02:49.502 FSPF 0 3 6 R3.00-00 NEWNODE NEWLSP LINKGOOD PREFIXGOOD AREAADDR IPADDR 08:02:51.870 FSPF 2 3 1 R1.00-00 LINKGOOD 08:05:46.551 FSPF 0 4 6 R4.00-00 NEWNODE NEWLSP LINKGOOD PREFIXGOOD AREAADDR IPADDR 08:05:48.919 FSPF 2 4 2 R2.00-00 LINKGOOD 08:20:48.973 FSPF 0 4 1 PERIODIC 08:21:38.921 FSPF 3 4 1 R2.00-00 OVLSET 08:24:16.725 FSPF 2 4 1 R2.00-00 OVLCLR 08:27:03.555 FSPF 2 4 3 R1.00-00 DELADJ LINKBAD 08:27:05.416 FSPF 0 4 1 R2.00-00 OVLSET 08:27:07.865 FSPF 2 4 2 R1.00-00 LINKGOOD RP/0/RP0/CPU0:R1#show isis lsp-log Sat Sep 12 08:28:26.761 UTC IS-IS 1 Level 2 LSP Generation Log Capacity: 50, Size: 8 When Count Interface Triggers --- Sat Sep 12 2026 --- 07:56:26.517 1 CONFIG 07:56:34.905 1 Lo0 IPUP 07:56:38.273 1 LSPDBOL 07:56:43.365 1 Gi0/0/0/0 MSD 07:59:50.034 1 Gi0/0/0/0 SABIT 08:02:51.819 1 Gi0/0/0/1 SABIT 08:27:03.504 1 Gi0/0/0/0 SABIT 08:27:07.814 1 Gi0/0/0/0 SABIT RP/0/RP0/CPU0:R1#show isis statistics Sat Sep 12 08:28:26.901 UTC IS-IS 1 Packet and Event Statistics Dropped Dropped Total PDUs Sent Received On Input By Update Hello: 439 381 0 - CSNP: 3 3 - 0 PSNP: 19 20 0 0 LSP: 24 19 0 0 LSP Retransmissions: 0 LSP Checksum Errors: 0 IS-IS Update Queue: 0/3500 Total Traffic: 42 High Water Mark: 2 HWM Set: Sat 2026 Sep 12 08:05:48.868 UTC Total Drops: 0 IS-IS Input Queue: 0/4200 Total Traffic: 423 High Water Mark: 2 Total Drops: 0 Level-2 LSPs sourced (new/refresh): 10/1 Route Calculations IPv4 Unicast Total: 17 Full SPF Calculations: 16 Periodic: 1 Partial Route Calc: 1 Next Hop Calculations: 0