RP/0/RP0/CPU0:R4#show version Tue Sep 8 15:01:30.297 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 25 minutes XRd Control Plane Container RP/0/RP0/CPU0:R4#show interface description Tue Sep 8 15:01:30.520 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 R3 (10.3.4.0/24) Gi0/0/0/1 admin-down admin-down Gi0/0/0/2 admin-down admin-down RP/0/RP0/CPU0:R4#show route Tue Sep 8 15:01:30.725 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 10.3.4.3, 00:12:51, GigabitEthernet0/0/0/0 i L2 2.2.2.2/32 [115/20] via 10.3.4.3, 00:17:14, GigabitEthernet0/0/0/0 i L2 3.3.3.3/32 [115/10] via 10.3.4.3, 00:17:14, GigabitEthernet0/0/0/0 L 4.4.4.4/32 is directly connected, 00:22:49, Loopback0 i L2 10.1.0.0/24 [115/20] via 10.3.4.3, 00:17:14, GigabitEthernet0/0/0/0 C 10.3.4.0/24 is directly connected, 00:22:44, GigabitEthernet0/0/0/0 L 10.3.4.4/32 is directly connected, 00:22:44, GigabitEthernet0/0/0/0 RP/0/RP0/CPU0:R4#show route isis Tue Sep 8 15:01:30.953 UTC i L2 1.1.1.1/32 [115/20] via 10.3.4.3, 00:12:51, GigabitEthernet0/0/0/0 i L2 2.2.2.2/32 [115/20] via 10.3.4.3, 00:17:14, GigabitEthernet0/0/0/0 i L2 3.3.3.3/32 [115/10] via 10.3.4.3, 00:17:14, GigabitEthernet0/0/0/0 i L2 10.1.0.0/24 [115/20] via 10.3.4.3, 00:17:14, GigabitEthernet0/0/0/0 RP/0/RP0/CPU0:R4#show isis Tue Sep 8 15:01:31.231 UTC IS-IS Router: 1 System Id: 0040.0400.4004 Hostname: R4 IS Levels: level-1-2 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: 6046 Respawn count: 2 Started: Tue 2026 Sep 08 14:43:42.218 UTC Null0 ready: Tue 2026 Sep 08 14:43:42.694 UTC Protocol shutdown: No System memory state: Normal Last change: never Memory state: Normal Last change: never Last/Initial memory usage/limit: 1595791/2147483648 0% Memory state monitoring interval: 60 s Memory usage/limit: 15080622/2147483648 0% Memory usage specifics (count/bytes): Nodes: 5/2040 LSPs: 5/2095 Links: 6/7344 Prefixes: 15/5160 Nets: 7/4432 Paths: 10/960 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: Tue 2026 Sep 08 14:43:43.506 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-1 Metric style (generate/accept): Narrow/Narrow Metric: 10 Level-2 Metric style (generate/accept): Narrow/Narrow 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) RP/0/RP0/CPU0:R4#show isis hostname Tue Sep 8 15:01:31.492 UTC IS-IS 1 hostnames Level System ID Dynamic Hostname 2 0020.0200.2002 R2 2 0030.0300.3003 R3 1,2 * 0040.0400.4004 R4 RP/0/RP0/CPU0:R4#show isis interface Tue Sep 8 15:01:31.617 UTC IS-IS 1 Interfaces Loopback0 Enabled Adjacency Formation: Disabled (Passive in IS-IS cfg) Prefix Advertisement: Enabled Bandwidth: 0 Circuit Type: level-1-2 Media Type: Loop Circuit Number: 0 IPv4 Unicast Topology: Enabled Adjacency Formation: Disabled (Intf passive in IS-IS cfg) Prefix Advertisement: Running Policy (L1/L2): -/- Metric (L1/L2): 0/0 Metric fallback: Bandwidth (L1/L2): Inactive/Inactive Anomaly (L1/L2): Inactive/Inactive Weight (L1/L2): 0/0 MPLS Max Label Stack: 0/0/0/0 (PRI/BKP/SRTE/SRAT) MPLS LDP Sync (L1/L2): Disabled/Disabled IPv4 Address Family: Enabled Protocol State: Up Forwarding Address: None (Intf passive in IS-IS cfg) Global Prefix: 4.4.4.4/32 PME Link Delays and Loss: - GigabitEthernet0/0/0/0 Enabled Adjacency Formation: Enabled Prefix Advertisement: Enabled Bandwidth: 1000000 RSI SRLG: Not Registered Circuit Type: level-1-2 Media Type: P2P Circuit Number: 0 Extended Circuit Number: 5 Last IIH Received: 15:01:29 (2.04 sec ago), 1497 octets Last IIH Sent: 15:01:23 (8.21 sec ago), 1497 octets Sending next P2P IIH in: 1 s IPv4 BFD: Disabled IPv6 BFD: Disabled Level-1 Adjacency Count: 0 Adjacency Flaps: 0 LSP Pacing Interval: 33 ms PSNP Entry Queue Size: 0 Hello Interval: 10 s Hello Multiplier: 3 Level-2 Adjacency Count: 1 Adjacency Flaps: 0 LSP Pacing Interval: 33 ms PSNP Entry Queue Size: 0 Hello Interval: 10 s Hello Multiplier: 3 CLNS I/O Protocol State: Up MTU: 1497 SNPA: 5254.0064.7f4e Layer-2 Multicast: All ISs: Listening IPv4 Unicast Topology: Enabled Adjacency Formation: Running Prefix Advertisement: Running Policy (L1/L2): -/- Metric (L1/L2): 10/10 Metric fallback: Bandwidth (L1/L2): Inactive/Inactive Anomaly (L1/L2): Inactive/Inactive Weight (L1/L2): 0/0 MPLS Max Label Stack: 1/3/7/7 (PRI/BKP/SRTE/SRAT) MPLS LDP Sync (L1/L2): Disabled/Disabled FRR (L1/L2): L1 Not Enabled L2 Not Enabled FRR Type: None None IPv4 Address Family: Enabled Protocol State: Up Forwarding Address: 10.3.4.4 Global Prefix: 10.3.4.0/24 LSP Transmission is: idle LSP Transmit Timer in: 0 ms LSP Burst Size: 10 LSPs in the next 0 ms LSP Rexmit Queue Size: 0 Adjacency Up: 14:43:44.599 Received CSNP complete: 14:43:45.351 LSP Pacing Start: 14:43:45.351 LSP fast flooding: Disabled PME Link Delays and Loss: - RP/0/RP0/CPU0:R4#show isis interface brief Tue Sep 8 15:01:31.742 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 0 1 1/1 1/1 Up 1497 - - RP/0/RP0/CPU0:R4#show isis neighbors Tue Sep 8 15:01:31.890 UTC IS-IS 1 neighbors: System Id Interface SNPA State Holdtime Type IETF-NSF R3 Gi0/0/0/0 *PtoP* Up 27 L2 Capable Total neighbor count: 1 RP/0/RP0/CPU0:R4#show isis neighbors detail Tue Sep 8 15:01:32.117 UTC IS-IS 1 neighbors: System Id Interface SNPA State Holdtime Type IETF-NSF R3 Gi0/0/0/0 *PtoP* Up 27 L2 Capable Area Address(es): 49.0001 IPv4 Address(es): 10.3.4.3* Topologies: 'IPv4 Unicast' Uptime: 00:17:47 Total neighbor count: 1 RP/0/RP0/CPU0:R4#show isis database Tue Sep 8 15:01:32.301 UTC IS-IS 1 (Level-1) Link State Database LSPID LSP Seq Num LSP Checksum LSP Holdtime/Rcvd ATT/P/OL R4.00-00 * 0x00000004 0x0367 840 /* 1/0/0 Total Level-1 LSP count: 1 Local Level-1 LSP count: 1 IS-IS 1 (Level-2) Link State Database LSPID LSP Seq Num LSP Checksum LSP Holdtime/Rcvd ATT/P/OL R2.00-00 0x00000007 0xdff9 426 /1200 0/0/0 R3.00-00 0x00000009 0xaaf0 1168 /1200 0/0/0 R3.01-00 0x00000003 0xd2f8 1017 /1200 0/0/0 R4.00-00 * 0x00000005 0x7df3 835 /* 0/0/0 Total Level-2 LSP count: 4 Local Level-2 LSP count: 1 RP/0/RP0/CPU0:R4#show isis database detail Tue Sep 8 15:01:32.479 UTC IS-IS 1 (Level-1) Link State Database LSPID LSP Seq Num LSP Checksum LSP Holdtime/Rcvd ATT/P/OL R4.00-00 * 0x00000004 0x0367 840 /* 1/0/0 Area Address: 49.0002 LSP MTU: 1492 NLPID: 0xcc IP Address: 4.4.4.4 Hostname: R4 Metric: 0 IP 4.4.4.4/32 Metric: 10 IP 10.3.4.0/24 Total Level-1 LSP count: 1 Local Level-1 LSP count: 1 IS-IS 1 (Level-2) Link State Database LSPID LSP Seq Num LSP Checksum LSP Holdtime/Rcvd ATT/P/OL R2.00-00 0x00000007 0xdff9 426 /1200 0/0/0 Area Address: 49.0001 LSP MTU: 1492 NLPID: 0xcc IP Address: 2.2.2.2 Hostname: R2 Metric: 10 IP 1.1.1.1/32 Metric: 0 IP 2.2.2.2/32 Metric: 10 IP 3.3.3.3/32 Metric: 10 IP 10.1.0.0/24 Metric: 20 IP 10.3.4.0/24 Metric: 10 IS R3.01 R3.00-00 0x00000009 0xaaf0 1168 /1200 0/0/0 Area Address: 49.0001 LSP MTU: 1492 NLPID: 0xcc IP Address: 3.3.3.3 Hostname: R3 Metric: 10 IP 1.1.1.1/32 Metric: 10 IP 2.2.2.2/32 Metric: 0 IP 3.3.3.3/32 Metric: 10 IP 10.1.0.0/24 Metric: 10 IP 10.3.4.0/24 Metric: 10 IS R3.01 Metric: 10 IS R4.00 R3.01-00 0x00000003 0xd2f8 1017 /1200 0/0/0 Metric: 0 IS R2.00 Metric: 0 IS R3.00 R4.00-00 * 0x00000005 0x7df3 834 /* 0/0/0 Area Address: 49.0002 LSP MTU: 1492 NLPID: 0xcc IP Address: 4.4.4.4 Hostname: R4 Metric: 0 IP 4.4.4.4/32 Metric: 10 IP 10.3.4.0/24 Metric: 10 IS R3.00 Total Level-2 LSP count: 4 Local Level-2 LSP count: 1 RP/0/RP0/CPU0:R4#show isis topology Tue Sep 8 15:01:32.639 UTC IS-IS 1 paths to IPv4 Unicast (Level-1) routers System Id Metric Next-Hop Interface SNPA R4 -- IS-IS 1 paths to IPv4 Unicast (Level-2) routers System Id Metric Next-Hop Interface SNPA R2 20 R3 Gi0/0/0/0 *PtoP* R3 10 R3 Gi0/0/0/0 *PtoP* R4 -- RP/0/RP0/CPU0:R4#show isis adjacency Tue Sep 8 15:01:32.804 UTC IS-IS 1 Level-1 adjacencies: System Id Interface SNPA State Hold Changed NSF IPv4 IPv6 BFD BFD IS-IS 1 Level-2 adjacencies: System Id Interface SNPA State Hold Changed NSF IPv4 IPv6 BFD BFD R3 Gi0/0/0/0 *PtoP* Up 26 00:17:48 Yes None None Total adjacency count: 1 RP/0/RP0/CPU0:R4#show isis adjacency detail Tue Sep 8 15:01:33.041 UTC IS-IS 1 Level-1 adjacencies: System Id Interface SNPA State Hold Changed NSF IPv4 IPv6 BFD BFD IS-IS 1 Level-2 adjacencies: System Id Interface SNPA State Hold Changed NSF IPv4 IPv6 BFD BFD R3 Gi0/0/0/0 *PtoP* Up 26 00:17:48 Yes None None Area Address: 49.0001 Neighbor IPv4 Address: 10.3.4.3* Topology: IPv4 Unicast BFD Status: Neighbor Useable (BFD Not Configured) Adjacency Flaps: 0 Total adjacency count: 1 RP/0/RP0/CPU0:R4#show isis spf-log Tue Sep 8 15:01:33.298 UTC IS-IS 1 Level 1 IPv4 Unicast Route Calculation Log Capacity: 210, Size: 4 Time Total Trig. Timestamp Type (ms) Nodes Count First Trigger LSP Triggers ------------ ----- ----- ----- ----- -------------------- ---------------------- --- Tue Sep 8 2026 --- 14:43:54.033 FSPF 0 1 7 R4.00-00 CONFIG NEWNODE NEWLSP OVLSET PREFIXGOOD AREAADDR IPADDR 14:43:56.113 FSPF 0 1 1 R4.00-00 OVLCLR 14:44:16.381 PRC 0 1 1 R4.00-00 ATTSET 14:58:56.164 FSPF 0 1 1 PERIODIC IS-IS 1 Level 2 IPv4 Unicast Route Calculation Log Capacity: 210, Size: 11 Time Total Trig. Timestamp Type (ms) Nodes Count First Trigger LSP Triggers ------------ ----- ----- ----- ----- -------------------- ---------------------- --- Tue Sep 8 2026 --- 14:43:54.035 FSPF 0 4 23 R2.00-00 CONFIG NEWNODE NEWLSP OVLSET LINKGOOD PREFIXGOOD AREAADDR IPADDR 14:43:54.046 NHC 0 4 1 R4.00-00 AREAADDR 14:43:54.737 FSPF 0 4 2 R2.00-00 OVLCLR PREFIXGOOD 14:43:56.112 FSPF 0 4 1 R4.00-00 OVLCLR 14:43:57.713 NHC 0 4 1 R3.00-00 AREAADDR 14:44:00.914 FSPF 0 4 2 R3.00-00 OVLCLR PREFIXGOOD 14:44:16.277 FSPF 2 4 1 R3.00-00 LINKGOOD 14:48:37.289 PRC 2 4 1 R3.00-00 PREFIXBAD 14:48:37.536 PRC 1 4 1 R2.00-00 PREFIXBAD 14:48:39.369 PRC 1 4 2 R3.00-00 PREFIXGOOD 14:59:16.331 FSPF 0 4 1 PERIODIC RP/0/RP0/CPU0:R4#show isis lsp-log Tue Sep 8 15:01:33.493 UTC IS-IS 1 Level 1 LSP Generation Log Capacity: 50, Size: 3 When Count Interface Triggers --- Tue Sep 8 2026 --- 14:43:43.078 2 Gi0/0/0/0 CONFIG MSD 14:43:56.061 1 LSPDBOL 14:44:16.331 1 ATTACHFLAG IS-IS 1 Level 2 LSP Generation Log Capacity: 50, Size: 4 When Count Interface Triggers --- Tue Sep 8 2026 --- 14:43:43.078 2 Gi0/0/0/0 CONFIG MSD 14:43:47.148 1 Gi0/0/0/0 SABIT 14:43:54.044 1 AREASET 14:43:56.061 1 LSPDBOL RP/0/RP0/CPU0:R4#show isis statistics Tue Sep 8 15:01:33.656 UTC IS-IS 1 Packet and Event Statistics Dropped Dropped Total PDUs Sent Received On Input By Update Hello: 126 125 0 - CSNP: 1 1 - 0 PSNP: 13 5 0 0 LSP: 5 17 0 0 LSP Retransmissions: 0 LSP Checksum Errors: 0 IS-IS Update Queue: 0/3500 Total Traffic: 23 High Water Mark: 1 HWM Set: Tue 2026 Sep 08 14:43:45.351 UTC Total Drops: 0 IS-IS Input Queue: 0/4200 Total Traffic: 148 High Water Mark: 1 Total Drops: 0 Level-1 LSPs sourced (new/refresh): 5/1 Route Calculations IPv4 Unicast Total: 4 Full SPF Calculations: 3 Periodic: 1 Partial Route Calc: 1 Next Hop Calculations: 0 Level-2 LSPs sourced (new/refresh): 5/1 Route Calculations IPv4 Unicast Total: 11 Full SPF Calculations: 6 Periodic: 1 Partial Route Calc: 3 Next Hop Calculations: 2 RP/0/RP0/CPU0:R4#show cef Tue Sep 8 15:01:33.770 UTC Prefix Next Hop Interface ------------------- ------------------- ------------------ 0.0.0.0/0 drop default handler 0.0.0.0/32 broadcast 1.1.1.1/32 10.3.4.3/32 GigabitEthernet0/0/0/0 2.2.2.2/32 10.3.4.3/32 GigabitEthernet0/0/0/0 3.3.3.3/32 10.3.4.3/32 GigabitEthernet0/0/0/0 4.4.4.4/32 receive Loopback0 10.1.0.0/24 10.3.4.3/32 GigabitEthernet0/0/0/0 10.3.4.0/24 attached GigabitEthernet0/0/0/0 10.3.4.0/32 broadcast GigabitEthernet0/0/0/0 10.3.4.3/32 10.3.4.3/32 GigabitEthernet0/0/0/0 10.3.4.4/32 receive GigabitEthernet0/0/0/0 10.3.4.255/32 broadcast GigabitEthernet0/0/0/0 224.0.0.0/4 0.0.0.0/32 224.0.0.0/24 receive 255.255.255.255/32 broadcast