RP/0/RP0/CPU0:R4#show version Thu Sep 10 14:31:20.789 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 59 minutes XRd Control Plane Container RP/0/RP0/CPU0:R4#show interface description Thu Sep 10 14:31:20.889 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 Thu Sep 10 14:31:21.112 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, 00:28:13, GigabitEthernet0/0/0/0 [115/20] via 10.3.4.3, 00:28:13, GigabitEthernet0/0/0/1 i L2 2.2.2.2/32 [115/10] via 10.2.4.2, 00:28:13, GigabitEthernet0/0/0/0 i L2 3.3.3.3/32 [115/10] via 10.3.4.3, 00:28:13, GigabitEthernet0/0/0/1 L 4.4.4.4/32 is directly connected, 00:56:47, Loopback0 i L2 10.1.0.0/24 [115/20] via 10.2.4.2, 00:28:13, GigabitEthernet0/0/0/0 [115/20] via 10.3.4.3, 00:28:13, GigabitEthernet0/0/0/1 C 10.2.4.0/24 is directly connected, 00:56:41, GigabitEthernet0/0/0/0 L 10.2.4.4/32 is directly connected, 00:56:41, GigabitEthernet0/0/0/0 C 10.3.4.0/24 is directly connected, 00:56:41, GigabitEthernet0/0/0/1 L 10.3.4.4/32 is directly connected, 00:56:41, GigabitEthernet0/0/0/1 RP/0/RP0/CPU0:R4#show route isis Thu Sep 10 14:31:21.300 UTC i L2 1.1.1.1/32 [115/20] via 10.2.4.2, 00:28:14, GigabitEthernet0/0/0/0 [115/20] via 10.3.4.3, 00:28:14, GigabitEthernet0/0/0/1 i L2 2.2.2.2/32 [115/10] via 10.2.4.2, 00:28:14, GigabitEthernet0/0/0/0 i L2 3.3.3.3/32 [115/10] via 10.3.4.3, 00:28:14, GigabitEthernet0/0/0/1 i L2 10.1.0.0/24 [115/20] via 10.2.4.2, 00:28:14, GigabitEthernet0/0/0/0 [115/20] via 10.3.4.3, 00:28:14, GigabitEthernet0/0/0/1 RP/0/RP0/CPU0:R4#show isis Thu Sep 10 14:31:21.470 UTC IS-IS Router: 1 System Id: 0040.0400.4004 Hostname: R4 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: 4359 Respawn count: 1 Started: Thu 2026 Sep 10 13:34:22.265 UTC Null0 ready: Thu 2026 Sep 10 13:34:23.770 UTC Protocol shutdown: No System memory state: Normal Last change: never Memory state: Normal Last change: never Last/Initial memory usage/limit: 1596873/2147483648 0% Memory state monitoring interval: 60 s Memory usage/limit: 13857785/2147483648 0% Memory usage specifics (count/bytes): Nodes: 5/2040 LSPs: 5/2090 Links: 10/12240 Prefixes: 11/10120 Nets: 7/4432 Paths: 16/1536 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: Thu 2026 Sep 10 13:34:24.766 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 Thu Sep 10 14:31:21.593 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:R4#show isis interface brief Thu Sep 10 14:31:21.740 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 Thu Sep 10 14:31:21.854 UTC IS-IS 1 neighbors: System Id Interface SNPA State Holdtime Type IETF-NSF R2 Gi0/0/0/0 *PtoP* Up 23 L2 Capable R3 Gi0/0/0/1 *PtoP* Up 22 L2 Capable Total neighbor count: 2 RP/0/RP0/CPU0:R4#show isis database Thu Sep 10 14:31:22.069 UTC IS-IS 1 (Level-2) Link State Database LSPID LSP Seq Num LSP Checksum LSP Holdtime/Rcvd ATT/P/OL R1.00-00 0x0000000b 0x5e37 930 /1200 0/0/0 R2.00-00 0x00000012 0xa19d 714 /1200 0/0/0 R2.01-00 0x00000009 0x4565 371 /1200 0/0/0 R3.00-00 0x0000000a 0xe832 350 /1200 0/0/0 R4.00-00 * 0x0000000c 0xa368 1002 /* 0/0/0 Total Level-2 LSP count: 5 Local Level-2 LSP count: 1 RP/0/RP0/CPU0:R4#show isis database detail Thu Sep 10 14:31:22.244 UTC IS-IS 1 (Level-2) Link State Database LSPID LSP Seq Num LSP Checksum LSP Holdtime/Rcvd ATT/P/OL R1.00-00 0x0000000b 0x5e37 930 /1200 0/0/0 Area Address: 49.0001 LSP MTU: 1492 NLPID: 0xcc IP Address: 1.1.1.1 Hostname: R1 Metric: 10 IS-Extended R2.01 Metric: 0 IP-Extended 1.1.1.1/32 Metric: 10 IP-Extended 10.1.0.0/24 R2.00-00 0x00000012 0xa19d 714 /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 R2.01 Metric: 10 IS-Extended R4.00 Metric: 0 IP-Extended 2.2.2.2/32 Metric: 10 IP-Extended 10.1.0.0/24 Metric: 10 IP-Extended 10.2.4.0/24 R2.01-00 0x00000009 0x4565 371 /1200 0/0/0 Metric: 0 IS-Extended R3.00 Metric: 0 IS-Extended R1.00 Metric: 0 IS-Extended R2.00 R3.00-00 0x0000000a 0xe832 350 /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 R2.01 Metric: 10 IS-Extended R4.00 Metric: 0 IP-Extended 3.3.3.3/32 Metric: 10 IP-Extended 10.1.0.0/24 Metric: 10 IP-Extended 10.3.4.0/24 R4.00-00 * 0x0000000c 0xa368 1002 /* 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: 5 Local Level-2 LSP count: 1 RP/0/RP0/CPU0:R4#show isis topology Thu Sep 10 14:31:22.334 UTC IS-IS 1 paths to IPv4 Unicast (Level-2) routers System Id Metric Next-Hop Interface SNPA R1 20 R3 Gi0/0/0/1 *PtoP* R1 20 R2 Gi0/0/0/0 *PtoP* 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 Thu Sep 10 14:31:22.497 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 via 10.3.4.3, GigabitEthernet0/0/0/1, R3, 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 10.1.0.0/24 [20/115] via 10.2.4.2, GigabitEthernet0/0/0/0, R2, Weight: 0 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 Thu Sep 10 14:31:22.617 UTC IS-IS 1 Level 2 Adjacency Log Capacity: 100, Size: 4 When System Interface State Details --- Thu Sep 10 2026 --- 13:34:40.277 R2 Gi0/0/0/0 d -> i 13:34:40.366 R3 Gi0/0/0/1 d -> i 13:34:40.888 R2 Gi0/0/0/0 i -> u New adjacency IPv4 Unicast Up 13:34:40.975 R3 Gi0/0/0/1 i -> u New adjacency IPv4 Unicast Up RP/0/RP0/CPU0:R4#show isis spf-log Thu Sep 10 14:31:22.745 UTC IS-IS 1 Level 2 IPv4 Unicast Route Calculation Log Capacity: 210, Size: 24 Time Total Trig. Timestamp Type (ms) Nodes Count First Trigger LSP Triggers ------------ ----- ----- ----- ----- -------------------- ---------------------- --- Thu Sep 10 2026 --- 13:34:34.959 FSPF 0 1 7 R4.00-00 CONFIG NEWNODE NEWLSP OVLSET PREFIXGOOD AREAADDR IPADDR 13:34:37.116 FSPF 0 1 1 R4.00-00 OVLCLR 13:34:39.866 PRC 0 1 1 R4.00-00 PREFIXGOOD 13:34:40.951 FSPF 0 5 21 R1.00-00 NEWNODE NEWLSP LINKGOOD PREFIXGOOD AREAADDR IPADDR 13:34:43.066 FSPF 0 5 1 R4.00-00 LINKGOOD 13:34:46.268 FSPF 3 5 2 R2.00-00 LINKGOOD 13:37:53.123 FSPF 1 5 2 R2.00-00 LINKBAD PREFIXBAD 13:39:03.124 FSPF 1 5 2 R2.00-00 LINKGOOD PREFIXGOOD 13:54:03.175 FSPF 0 5 1 PERIODIC 13:56:03.323 FSPF 1 5 2 R2.00-00 LINKBAD PREFIXBAD 13:59:26.324 FSPF 1 5 2 R2.00-00 LINKBAD PREFIXBAD 14:02:08.623 FSPF 1 5 2 R2.00-00 LINKGOOD PREFIXGOOD 14:02:33.066 FSPF 1 5 2 R1.00-00 LINKBAD PREFIXBAD 14:02:44.523 FSPF 1 5 3 R2.00-00 LINKBAD PREFIXBAD 14:02:55.961 FSPF 1 5 2 R3.00-00 LINKBAD PREFIXBAD 14:03:07.170 FSPF 0 5 21 R1.00-00 CONFIG DELNODE LSPEXPIRY LINKBAD PREFIXBAD AREAADDR IPADDR 14:03:07.371 FSPF 2 5 28 R1.00-00 CONFIG NEWNODE NEWLSP LINKGOOD PREFIXGOOD AREAADDR IPADDR 14:05:26.825 FSPF 1 5 2 R2.00-00 LINKBAD PREFIXBAD 14:07:11.723 FSPF 1 5 2 R2.00-00 LINKGOOD PREFIXGOOD 14:17:07.575 FSPF 1 5 2 R2.00-00 LINKBAD PREFIXBAD 14:20:14.724 FSPF 1 5 2 R2.00-00 LINKBAD PREFIXBAD 14:23:17.023 FSPF 1 5 2 R2.00-00 LINKGOOD PREFIXGOOD 14:24:52.485 PRC 0 5 1 R4.00-00 PREFIXGOOD 14:28:04.901 PRC 0 5 1 R4.00-00 PREFIXBAD RP/0/RP0/CPU0:R4#show isis lsp-log Thu Sep 10 14:31:22.866 UTC IS-IS 1 Level 2 LSP Generation Log Capacity: 50, Size: 9 When Count Interface Triggers --- Thu Sep 10 2026 --- 13:34:25.023 1 CONFIG 13:34:27.258 1 CONFIG 13:34:33.813 1 Lo0 IPUP 13:34:37.065 1 LSPDBOL 13:34:39.814 2 Gi0/0/0/1 IPUP MSD 13:34:43.015 2 Gi0/0/0/1 NEWADJ 14:03:07.237 1 Lo0 IPDOWN 14:24:52.434 1 Unknown IPUP 14:28:04.850 1 IPDOWN RP/0/RP0/CPU0:R4#show isis statistics Thu Sep 10 14:31:23.085 UTC IS-IS 1 Packet and Event Statistics Dropped Dropped Total PDUs Sent Received On Input By Update Hello: 785 778 0 - CSNP: 2 2 - 0 PSNP: 52 37 0 0 LSP: 40 59 0 0 LSP Retransmissions: 0 LSP Checksum Errors: 0 IS-IS Update Queue: 0/3500 Total Traffic: 98 High Water Mark: 4 HWM Set: Thu 2026 Sep 10 13:34:40.894 UTC Total Drops: 0 IS-IS Input Queue: 0/4200 Total Traffic: 876 High Water Mark: 4 Total Drops: 0 Level-2 LSPs sourced (new/refresh): 11/3 Route Calculations IPv4 Unicast Total: 24 Full SPF Calculations: 21 Periodic: 1 Partial Route Calc: 3 Next Hop Calculations: 0 RP/0/RP0/CPU0:R4#show cef Thu Sep 10 14:31:23.357 UTC Prefix Next Hop Interface ------------------- ------------------- ------------------ 0.0.0.0/0 drop default handler 0.0.0.0/32 broadcast 1.1.1.1/32 10.2.4.2/32 GigabitEthernet0/0/0/0 10.3.4.3/32 GigabitEthernet0/0/0/1 2.2.2.2/32 10.2.4.2/32 GigabitEthernet0/0/0/0 3.3.3.3/32 10.3.4.3/32 GigabitEthernet0/0/0/1 4.4.4.4/32 receive Loopback0 10.1.0.0/24 10.2.4.2/32 GigabitEthernet0/0/0/0 10.3.4.3/32 GigabitEthernet0/0/0/1 10.2.4.0/24 attached GigabitEthernet0/0/0/0 10.2.4.0/32 broadcast GigabitEthernet0/0/0/0 10.2.4.2/32 10.2.4.2/32 GigabitEthernet0/0/0/0 10.2.4.4/32 receive GigabitEthernet0/0/0/0 10.2.4.255/32 broadcast GigabitEthernet0/0/0/0 10.3.4.0/24 attached GigabitEthernet0/0/0/1 10.3.4.0/32 broadcast GigabitEthernet0/0/0/1 10.3.4.3/32 10.3.4.3/32 GigabitEthernet0/0/0/1 10.3.4.4/32 receive GigabitEthernet0/0/0/1 10.3.4.255/32 broadcast GigabitEthernet0/0/0/1 224.0.0.0/4 0.0.0.0/32 224.0.0.0/24 receive 255.255.255.255/32 broadcast RP/0/RP0/CPU0:R4#show route summary Thu Sep 10 14:31:23.639 UTC Route Source Routes Backup Deleted Memory(bytes) connected 2 1 0 600 local 3 0 0 600 application fib_mgr 0 0 0 0 isis 1 4 2 0 1280 dagr 0 0 0 0 Total 9 3 0 2480