RP/0/RP0/CPU0:R4#show version Mon Sep 7 07:11:51.530 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 35 minutes XRd Control Plane Container RP/0/RP0/CPU0:R4#show interface description Mon Sep 7 07:11:51.744 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 Mon Sep 7 07:11:51.963 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 10.3.4.3 to network 0.0.0.0 i*L1 0.0.0.0/0 [115/10] via 10.3.4.3, 00:02:15, GigabitEthernet0/0/0/0 i L1 3.3.3.3/32 [115/10] via 10.3.4.3, 00:02:15, GigabitEthernet0/0/0/0 L 4.4.4.4/32 is directly connected, 00:32:36, Loopback0 i L1 10.2.3.0/24 [115/20] via 10.3.4.3, 00:02:15, GigabitEthernet0/0/0/0 C 10.3.4.0/24 is directly connected, 00:32:31, GigabitEthernet0/0/0/0 L 10.3.4.4/32 is directly connected, 00:32:31, GigabitEthernet0/0/0/0 RP/0/RP0/CPU0:R4#show route isis Mon Sep 7 07:11:52.239 UTC i*L1 0.0.0.0/0 [115/10] via 10.3.4.3, 00:02:16, GigabitEthernet0/0/0/0 i L1 3.3.3.3/32 [115/10] via 10.3.4.3, 00:02:16, GigabitEthernet0/0/0/0 i L1 10.2.3.0/24 [115/20] via 10.3.4.3, 00:02:16, GigabitEthernet0/0/0/0 RP/0/RP0/CPU0:R4#show isis Mon Sep 7 07:11:52.444 UTC IS-IS Router: 1 System Id: 0040.0400.4004 Hostname: R4 IS Levels: level-1 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: 4390 Respawn count: 1 Started: Mon 2026 Sep 07 06:39:03.645 UTC Null0 ready: Mon 2026 Sep 07 06:39:05.333 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: 13786749/2147483648 0% Memory usage specifics (count/bytes): Nodes: 2/816 LSPs: 2/840 Links: 2/2448 Prefixes: 6/2064 Nets: 5/3056 Paths: 8/768 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: Mon 2026 Sep 07 06:39:06.249 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 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 Mon Sep 7 07:11:52.683 UTC IS-IS 1 hostnames Level System ID Dynamic Hostname 1 0030.0300.3003 R3 1 * 0040.0400.4004 R4 RP/0/RP0/CPU0:R4#show isis interface Mon Sep 7 07:11:52.810 UTC IS-IS 1 Interfaces Loopback0 Enabled Adjacency Formation: Disabled (Passive in IS-IS cfg) Prefix Advertisement: Enabled Bandwidth: 0 Circuit Type: level-1 (Configured: 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 (Configured: level-1-2) Media Type: P2P Circuit Number: 0 Extended Circuit Number: 5 Last IIH Received: 07:11:43 (9.18 sec ago), 1497 octets Last PDU Rejected: 07:09:30 (00:02:22 ago), 1497 octets, P2P IIH, Too many Nbrs on P2P Intf Last IIH Sent: 07:11:48 (4.63 sec ago), 1497 octets Sending next P2P IIH in: 4 s IPv4 BFD: Disabled IPv6 BFD: Disabled Level-1 Adjacency Count: 1 Adjacency Flaps: 2 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: 5254.00de.f37c 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: 8 LSPs in the next 0 ms LSP Rexmit Queue Size: 0 Adjacency Up: 07:09:36.111 Received CSNP complete: 07:09:36.421 LSP Pacing Start: 07:09:36.421 LSP fast flooding: Disabled PME Link Delays and Loss: - RP/0/RP0/CPU0:R4#show isis interface brief Mon Sep 7 07:11:52.946 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 - - RP/0/RP0/CPU0:R4#show isis neighbors Mon Sep 7 07:11:53.182 UTC IS-IS 1 neighbors: System Id Interface SNPA State Holdtime Type IETF-NSF R3 Gi0/0/0/0 *PtoP* Up 29 L1 Capable Total neighbor count: 1 RP/0/RP0/CPU0:R4#show isis neighbors detail Mon Sep 7 07:11:53.331 UTC IS-IS 1 neighbors: System Id Interface SNPA State Holdtime Type IETF-NSF R3 Gi0/0/0/0 *PtoP* Up 29 L1 Capable Area Address(es): 49.0002 IPv4 Address(es): 10.3.4.3* Topologies: 'IPv4 Unicast' Uptime: 00:02:17 Total neighbor count: 1 RP/0/RP0/CPU0:R4#show isis database Mon Sep 7 07:11:53.542 UTC IS-IS 1 (Level-1) Link State Database LSPID LSP Seq Num LSP Checksum LSP Holdtime/Rcvd ATT/P/OL R3.00-00 0x00000003 0x1bb2 1062 /1199 1/0/0 R4.00-00 * 0x0000000b 0x6ffd 1062 /* 0/0/0 Total Level-1 LSP count: 2 Local Level-1 LSP count: 1 RP/0/RP0/CPU0:R4#show isis database detail Mon Sep 7 07:11:53.775 UTC IS-IS 1 (Level-1) Link State Database LSPID LSP Seq Num LSP Checksum LSP Holdtime/Rcvd ATT/P/OL R3.00-00 0x00000003 0x1bb2 1062 /1199 1/0/0 Area Address: 49.0002 LSP MTU: 1492 NLPID: 0xcc IP Address: 3.3.3.3 Hostname: R3 Metric: 0 IP 3.3.3.3/32 Metric: 10 IP 10.2.3.0/24 Metric: 10 IP 10.3.4.0/24 Metric: 10 IS R4.00 R4.00-00 * 0x0000000b 0x6ffd 1062 /* 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-1 LSP count: 2 Local Level-1 LSP count: 1 RP/0/RP0/CPU0:R4#show isis topology Mon Sep 7 07:11:53.889 UTC IS-IS 1 paths to IPv4 Unicast (Level-1) routers System Id Metric Next-Hop Interface SNPA R3 10 R3 Gi0/0/0/0 *PtoP* R4 -- RP/0/RP0/CPU0:R4#show isis adjacency Mon Sep 7 07:11:54.054 UTC IS-IS 1 Level-1 adjacencies: System Id Interface SNPA State Hold Changed NSF IPv4 IPv6 BFD BFD R3 Gi0/0/0/0 *PtoP* Up 29 00:02:17 Yes None None Total adjacency count: 1 RP/0/RP0/CPU0:R4#show isis adjacency detail Mon Sep 7 07:11:54.244 UTC IS-IS 1 Level-1 adjacencies: System Id Interface SNPA State Hold Changed NSF IPv4 IPv6 BFD BFD R3 Gi0/0/0/0 *PtoP* Up 28 00:02:18 Yes None None Area Address: 49.0002 Neighbor IPv4 Address: 10.3.4.3* Topology: IPv4 Unicast BFD Status: Neighbor Useable (BFD Not Configured) Adjacency Flaps: 2 Total adjacency count: 1 RP/0/RP0/CPU0:R4#show isis spf-log Mon Sep 7 07:11:54.522 UTC IS-IS 1 Level 1 IPv4 Unicast Route Calculation Log Capacity: 210, Size: 15 Time Total Trig. Timestamp Type (ms) Nodes Count First Trigger LSP Triggers ------------ ----- ----- ----- ----- -------------------- ---------------------- --- Mon Sep 7 2026 --- 06:39:17.435 FSPF 0 1 7 R4.00-00 CONFIG NEWNODE NEWLSP OVLSET PREFIXGOOD AREAADDR IPADDR 06:39:19.681 FSPF 0 1 1 R4.00-00 OVLCLR 06:39:22.197 FSPF 0 2 5 R3.00-00 NEWNODE NEWLSP PREFIXGOOD AREAADDR IPADDR 06:39:22.998 PRC 0 2 1 R4.00-00 PREFIXGOOD 06:39:24.941 PRC 0 2 1 R3.00-00 ATTSET 06:39:28.142 FSPF 3 2 2 R4.00-00 LINKGOOD 06:53:40.769 PRC 1 2 1 R3.00-00 ATTCLR 06:53:47.977 PRC 1 2 1 R3.00-00 ATTSET 06:54:28.196 FSPF 0 2 1 PERIODIC 07:05:08.788 FSPF 2 2 7 R3.00-00 DELNODE LSPEXPIRY ATTCLR LINKBAD PREFIXBAD AREAADDR IPADDR 07:05:38.840 FSPF 0 2 1 R4.00-00 LINKBAD 07:05:40.012 FSPF 2 3 7 0020.0200.2002.00-00 NEWNODE NEWLSP LINKGOOD PREFIXGOOD AREAADDR IPADDR 07:09:03.882 FSPF 2 2 6 0020.0200.2002.00-00 DELNODE LSPEXPIRY LINKBAD PREFIXBAD AREAADDR IPADDR 07:09:33.933 FSPF 0 2 1 R4.00-00 LINKBAD 07:09:36.169 FSPF 2 3 8 R3.00-00 NEWNODE NEWLSP ATTSET LINKGOOD PREFIXGOOD AREAADDR IPADDR RP/0/RP0/CPU0:R4#show isis lsp-log Mon Sep 7 07:11:54.644 UTC IS-IS 1 Level 1 LSP Generation Log Capacity: 50, Size: 10 When Count Interface Triggers --- Mon Sep 7 2026 --- 06:39:06.429 1 CONFIG 06:39:08.629 1 CONFIG 06:39:15.694 1 Lo0 IPUP 06:39:19.629 1 LSPDBOL 06:39:22.201 2 Gi0/0/0/0 MSD SABIT 06:39:25.402 1 Gi0/0/0/0 SABIT 07:05:38.789 2 Gi0/0/0/0 DELADJ BESTADJ 07:05:40.005 1 Gi0/0/0/0 NEWADJ 07:09:33.882 2 Gi0/0/0/0 DELADJ BESTADJ 07:09:36.162 1 Gi0/0/0/0 NEWADJ RP/0/RP0/CPU0:R4#show isis statistics Mon Sep 7 07:11:54.841 UTC IS-IS 1 Packet and Event Statistics Dropped Dropped Total PDUs Sent Received On Input By Update Hello: 231 231 0 - CSNP: 3 3 - 0 PSNP: 11 7 0 0 LSP: 7 11 0 0 LSP Retransmissions: 0 LSP Checksum Errors: 0 IS-IS Update Queue: 0/3500 Total Traffic: 21 High Water Mark: 1 HWM Set: Mon 2026 Sep 07 06:39:22.146 UTC Total Drops: 0 IS-IS Input Queue: 0/4200 Total Traffic: 252 High Water Mark: 1 Total Drops: 0 Level-1 LSPs sourced (new/refresh): 12/1 Route Calculations IPv4 Unicast Total: 15 Full SPF Calculations: 11 Periodic: 1 Partial Route Calc: 4 Next Hop Calculations: 0 RP/0/RP0/CPU0:R4#show cef Mon Sep 7 07:11:55.046 UTC Prefix Next Hop Interface ------------------- ------------------- ------------------ 0.0.0.0/0 10.3.4.3/32 GigabitEthernet0/0/0/0 0.0.0.0/32 broadcast 3.3.3.3/32 10.3.4.3/32 GigabitEthernet0/0/0/0 4.4.4.4/32 receive Loopback0 10.2.3.0/24 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