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OPERATIONAL DEFECT DATABASE
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The Fabric Border is used as a Seed device and the system MTU is set to 9100 when the discovered interface has configured MTU 1500 in the interface level and LAN automation is started, we can observe the MTU in software is set properly but Jumbo MTU is still 1500 and impacting the traffic.
Cat9600 C9600-SUP-1 running IOS-XE version 17.6.3 Affected Line card C9600-LC-48YL. Cat9600#show system mtu Global Ethernet MTU is 9100 bytes. Cat9600# show run int tw 1/2/0/31 Building configuration... Current configuration : 299 bytes ! interface TwentyFiveGigE1/2/0/31 description Fabric Physical Link no switchport dampening ip address 1.1.1.1 255.255.255.254 no ip redirects ip pim sparse-mode ip router isis load-interval 30 bfd interval 250 min_rx 250 multiplier 3 clns mtu 1400 isis network point-to-point end Cat9600#show int tw 1/2/0/31 TwentyFiveGigE1/2/0/31 is up, line protocol is up (connected) Hardware is Twenty Five Gigabit Ethernet, address is a0b4.3917.1002 (bia a0b4.3917.1002) Description: Fabric Physical Link Internet address is 1.1.1.1/31 MTU 9100 bytes, BW 100000 Kbit/sec, <------------ Cat9600#ping 1.1.1.2 df size 9100 repeat 3 Type escape sequence to abort. Sending 100, 9100-byte ICMP Echos to [10.14.34.12](https://10.14.34.12), timeout is 2 seconds: Packet sent with the DF bit set ... Success rate is 0 percent (0/3) Cat9600#ping 1.1.1.2 df size 1500 repeat 100 Type escape sequence to abort. Sending 100, 1500-byte ICMP Echos to [10.14.34.12](https://10.14.34.12), timeout is 2 seconds: Packet sent with the DF bit set !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Success rate is 100 percent (100/100), Cat9600#show pm port interface tw1/2/0/31 port 9/31 pd 0x7F9FC1CE7EB8 swidb 0x7F9FC7E24228(routed) sb 0x7F9FC7BE9158 hwidb 0x7F9FC9BD2488 if_number = 671 hw_if_index = 670 snmp_if_index = 82(82) ptrunkgroup = 0(port) admin up(up) line up(up) operErr none port assigned mac address a0b4.3917.1002 idb port vlan id 4095 default vlan id 4095 internalVlan 0x0 remapVlan 0x0 vlans: none trunkVlans: none fwdVlans: none currentlyPrunedVlans: none previouslyPrunedVlans: none protocols: ip=on ipx=on misc=on other=on Config values: access mode: static access vlanid: 1 native vlanid: 1 trunkVlans: 1-4093 pruneVlans: 2-1001primary host vlanid: 32767 secondary host vlanid: 32767 primary promiscuous vlanid: 32767 secondary prom vlans: none speed: 1000M speedauto: auto-default duplex: full mode: routed encap: dot1q nonegotiate: false jumbo cap: true jumbo: false mtu: 1500 <--- this should be 9100 Cat9600#show platform pm POrt-Data TWentyFiveGigE 1/2/0/31 # Field AdminFields OperFields Access Mode Static Static Access Vlan Id 1 0 Voice Vlan Id 4096 0 VLAN Unassigned 1 ExAccess Vlan Id 32767 Native Vlan Id 1 Port Mode routed routed Encapsulation 802.1Q Native disl auto Media unknown DTP Nonegotiate 0 0 Port Protected 0 0 Unknown Unicast Blocked 0 0 Unknown Multicast Blocked 0 0 Vepa Enabled 0 0 App interface 0 0 Span Destination 0 Duplex full full Default Duplex full Speed 1000 1000 Auto Speed Capable 0 0 No Negotiate 0 0 No Negotiate Capable 1024 1024 Flow Control Receive ON ON Flow Control Send Off Off Jumbo 0 0 saved_holdqueue_out 0 saved_input_defqcount 2000 Jumbo Size 1500 <--- same it should be 9100 Cat9600# show platform software fed switch active ifm if-id 0x29f Interface IF_ID : 0x000000000000029f Interface Name : TwentyFiveGigE1/2/0/31 Interface Block Pointer : 0x7f7071826a48 Interface Block State : READY Interface State : Enabled Interface Status : ADD, UPD Interface Ref-Cnt : 7 Interface Type : ETHER Port Type : ROUTE PORT Port Location : LOCAL Slot : 9 Unit : 0 Slot Unit : 31 SNMP IF Index : 82 GPN : 127 EC Channel : 0 EC Index : 0 Port Handle : 0xd5000326 IPv4 MTU : 9100 <--- right MTU Jumbo MTU ............ [1500] <————— should be 9100
Redundancy switchover for SVL over the 2 supervisors. This means completing 2 switchovers from active to standby and standby to the old active. or Reload the system.
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