RP/0/RP0/CPU0:R4#show version Fri Sep 11 08:08:03.698 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 R4 uptime is 15 minutes XRd Control Plane Container RP/0/RP0/CPU0:R4#show interface description Fri Sep 11 08:08:03.853 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 (10.2.4.0/24 p2p) Gi0/0/0/1 up up to R3 (10.3.4.0/24 p2p) Gi0/0/0/2 admin-down admin-down RP/0/RP0/CPU0:R4#show route Fri Sep 11 08:08:04.105 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 i L2 1.1.1.1/32 [115/20] via 10.2.4.2, 00:13:26, GigabitEthernet0/0/0/0 i L2 2.2.2.2/32 [115/10] via 10.2.4.2, 00:13:26, GigabitEthernet0/0/0/0 i L2 3.3.3.3/32 [115/10] via 10.3.4.3, 00:13:26, GigabitEthernet0/0/0/1 L 4.4.4.4/32 is directly connected, 00:13:36, Loopback0 i L2 10.1.2.0/24 [115/20] via 10.2.4.2, 00:13:26, GigabitEthernet0/0/0/0 i L2 10.1.3.0/24 [115/30] via 10.3.4.3, 00:13:26, GigabitEthernet0/0/0/1 C 10.2.4.0/24 is directly connected, 00:13:31, GigabitEthernet0/0/0/0 L 10.2.4.4/32 is directly connected, 00:13:31, GigabitEthernet0/0/0/0 C 10.3.4.0/24 is directly connected, 00:13:31, GigabitEthernet0/0/0/1 L 10.3.4.4/32 is directly connected, 00:13:31, GigabitEthernet0/0/0/1 RP/0/RP0/CPU0:R4#show route isis Fri Sep 11 08:08:04.259 UTC i L2 1.1.1.1/32 [115/20] via 10.2.4.2, 00:13:26, GigabitEthernet0/0/0/0 i L2 2.2.2.2/32 [115/10] via 10.2.4.2, 00:13:26, GigabitEthernet0/0/0/0 i L2 3.3.3.3/32 [115/10] via 10.3.4.3, 00:13:26, GigabitEthernet0/0/0/1 i L2 10.1.2.0/24 [115/20] via 10.2.4.2, 00:13:26, GigabitEthernet0/0/0/0 i L2 10.1.3.0/24 [115/30] via 10.3.4.3, 00:13:26, GigabitEthernet0/0/0/1 RP/0/RP0/CPU0:R4#show route 0.0.0.0/0 Fri Sep 11 08:08:04.425 UTC % Network not in table RP/0/RP0/CPU0:R4#show isis Fri Sep 11 08:08:04.571 UTC IS-IS Router: 1 System Id: 0040.0400.4004 Hostname: R4 IS Levels: level-2-only Manual area address(es): 49.0002 Routing for area address(es): 49.0002 Multi-Instance Id: 0 Running on: RP/0/RP0/CPU0 Job Id: 1003 PID: 4148 Respawn count: 1 Started: Fri 2026 Sep 11 07:54:16.759 UTC Null0 ready: Fri 2026 Sep 11 07:54:18.063 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: 13835658/2147483648 0% Memory usage specifics (count/bytes): Nodes: 3/1224 LSPs: 3/1258 Links: 4/4896 Prefixes: 17/15640 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: Fri 2026 Sep 11 07:54:19.154 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:R4#show isis hostname Fri Sep 11 08:08:04.712 UTC IS-IS 1 hostnames Level System ID Dynamic Hostname 2 0020.0200.2002 R2 2 0030.0300.3003 R3 2 * 0040.0400.4004 R4 RP/0/RP0/CPU0:R4#show isis interface brief Fri Sep 11 08:08:04.825 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:R4#show isis neighbors Fri Sep 11 08:08:04.984 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 27 L2 Capable Total neighbor count: 2 RP/0/RP0/CPU0:R4#show isis database Fri Sep 11 08:08:05.171 UTC IS-IS 1 (Level-2) Link State Database LSPID LSP Seq Num LSP Checksum LSP Holdtime/Rcvd ATT/P/OL R2.00-00 0x00000008 0x6f8f 1158 /1200 0/0/0 R3.00-00 0x00000008 0xc4c2 1053 /1200 0/0/0 R4.00-00 * 0x00000006 0xb65a 1083 /* 0/0/0 Total Level-2 LSP count: 3 Local Level-2 LSP count: 1 RP/0/RP0/CPU0:R4#show isis database detail Fri Sep 11 08:08:05.323 UTC IS-IS 1 (Level-2) Link State Database LSPID LSP Seq Num LSP Checksum LSP Holdtime/Rcvd ATT/P/OL R2.00-00 0x00000008 0x6f8f 1158 /1200 0/0/0 Area Address: 49.0001 LSP MTU: 1492 NLPID: 0xcc IP Address: 2.2.2.2 Hostname: R2 Metric: 10 IS-Extended R4.00 Metric: 10 IP-Extended 1.1.1.1/32 Metric: 0 IP-Extended 2.2.2.2/32 Metric: 30 IP-Extended 3.3.3.3/32 Metric: 10 IP-Extended 10.1.2.0/24 Metric: 30 IP-Extended 10.1.3.0/24 Metric: 10 IP-Extended 10.2.4.0/24 Metric: 40 IP-Extended 10.3.4.0/24 R3.00-00 0x00000008 0xc4c2 1052 /1200 0/0/0 Area Address: 49.0001 LSP MTU: 1492 NLPID: 0xcc IP Address: 3.3.3.3 Hostname: R3 Metric: 10 IS-Extended R4.00 Metric: 20 IP-Extended 1.1.1.1/32 Metric: 50 IP-Extended 2.2.2.2/32 Metric: 0 IP-Extended 3.3.3.3/32 Metric: 50 IP-Extended 10.1.2.0/24 Metric: 20 IP-Extended 10.1.3.0/24 Metric: 60 IP-Extended 10.2.4.0/24 Metric: 10 IP-Extended 10.3.4.0/24 R4.00-00 * 0x00000006 0xb65a 1083 /* 0/0/0 Area Address: 49.0002 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: 3 Local Level-2 LSP count: 1 RP/0/RP0/CPU0:R4#show isis topology Fri Sep 11 08:08:05.444 UTC IS-IS 1 paths to IPv4 Unicast (Level-2) routers System Id Metric Next-Hop Interface SNPA R2 10 R2 Gi0/0/0/0 *PtoP* R3 10 R3 Gi0/0/0/1 *PtoP* R4 -- RP/0/RP0/CPU0:R4#show isis route Fri Sep 11 08:08:05.630 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 L2 1.1.1.1/32 [20/115] via 10.2.4.2, GigabitEthernet0/0/0/0, R2, Weight: 0 L2 2.2.2.2/32 [10/115] via 10.2.4.2, GigabitEthernet0/0/0/0, R2, Weight: 0 L2 3.3.3.3/32 [10/115] via 10.3.4.3, GigabitEthernet0/0/0/1, R3, Weight: 0 C 4.4.4.4/32 is directly connected, Loopback0 L2 10.1.2.0/24 [20/115] via 10.2.4.2, GigabitEthernet0/0/0/0, R2, Weight: 0 L2 10.1.3.0/24 [30/115] via 10.3.4.3, GigabitEthernet0/0/0/1, R3, Weight: 0 C 10.2.4.0/24 is directly connected, GigabitEthernet0/0/0/0 C 10.3.4.0/24 is directly connected, GigabitEthernet0/0/0/1 RP/0/RP0/CPU0:R4#show isis adjacency-log Fri Sep 11 08:08:05.794 UTC IS-IS 1 Level 2 Adjacency Log Capacity: 100, Size: 4 When System Interface State Details --- Fri Sep 11 2026 --- 07:54:33.070 R2 Gi0/0/0/0 d -> i 07:54:33.070 R3 Gi0/0/0/1 d -> i 07:54:33.678 R3 Gi0/0/0/1 i -> u New adjacency IPv4 Unicast Up 07:54:33.679 R2 Gi0/0/0/0 i -> u New adjacency IPv4 Unicast Up RP/0/RP0/CPU0:R4#show isis spf-log Fri Sep 11 08:08:05.922 UTC IS-IS 1 Level 2 IPv4 Unicast Route Calculation Log Capacity: 210, Size: 7 Time Total Trig. Timestamp Type (ms) Nodes Count First Trigger LSP Triggers ------------ ----- ----- ----- ----- -------------------- ---------------------- --- Fri Sep 11 2026 --- 07:54:19.359 FSPF 0 0 2 CONFIG 07:54:29.263 FSPF 0 1 7 R4.00-00 CONFIG NEWNODE NEWLSP OVLSET PREFIXGOOD AREAADDR IPADDR 07:54:31.421 FSPF 0 1 1 R4.00-00 OVLCLR 07:54:32.602 PRC 0 1 1 R4.00-00 PREFIXGOOD 07:54:34.202 FSPF 0 3 11 R3.00-00 NEWNODE NEWLSP LINKGOOD PREFIXGOOD AREAADDR IPADDR 07:54:37.403 FSPF 2 3 2 R3.00-00 LINKGOOD 08:05:38.299 PRC 0 3 1 R3.00-00 PREFIXBAD RP/0/RP0/CPU0:R4#show isis lsp-log Fri Sep 11 08:08:06.040 UTC IS-IS 1 Level 2 LSP Generation Log Capacity: 50, Size: 5 When Count Interface Triggers --- Fri Sep 11 2026 --- 07:54:19.422 1 CONFIG 07:54:28.051 1 Lo0 IPUP 07:54:31.370 1 LSPDBOL 07:54:32.514 1 Gi0/0/0/0 IPUP 07:54:34.116 2 Gi0/0/0/0 NEWADJ RP/0/RP0/CPU0:R4#show isis statistics Fri Sep 11 08:08:06.176 UTC IS-IS 1 Packet and Event Statistics Dropped Dropped Total PDUs Sent Received On Input By Update Hello: 195 188 0 - CSNP: 2 2 - 0 PSNP: 6 10 0 0 LSP: 10 6 0 0 LSP Retransmissions: 0 LSP Checksum Errors: 0 IS-IS Update Queue: 0/3500 Total Traffic: 18 High Water Mark: 2 HWM Set: Fri 2026 Sep 11 07:54:34.686 UTC Total Drops: 0 IS-IS Input Queue: 0/4200 Total Traffic: 206 High Water Mark: 2 Total Drops: 0 Level-2 LSPs sourced (new/refresh): 7/1 Route Calculations IPv4 Unicast Total: 7 Full SPF Calculations: 5 Periodic: 0 Partial Route Calc: 2 Next Hop Calculations: 0