HI
I am trying to run Layer3 with LACP Port-channels from C6k--L3(lacp)--JuniperEX4200 running ospf. It comes up in EXSTART state so deb ip osp adj and see Juniper sending mtu of 1482. Since 1482 is not support on Cisco, I hard-code mtu on both Cisco and Juniper to 1500 but no good so tried on cisco interface "ip opsf mtu-ignore" and still no good. If I take out port-channel and use a normal Layer 3 physical interface or just use L2 port-channel or L2 trunks, it works but I rather have it working with L3 LACP. For simplicity, I only use one physicaly interface for the port-channels right now.
Aug 28 16:19:46.430: OSPF: Send DBD to 10.0.38.6 on Port-channel98 seq 0xE6E opt 0x42 flag 0x7 len 32
Aug 28 16:19:46.430: OSPF: Retransmitting DBD to 10.0.38.6 on Port-channel98 [7]
Aug 28 16:19:47.270: OSPF: Rcv DBD from 10.0.38.6 on Port-channel98 seq 0xA0873C6 opt 0x42 flag 0x7 len 32 mtu 1486 state EXSTART
Aug 28 16:19:47.270: OSPF: First DBD and we are not SLAVE
I ABOVE REPEATS ITSELF FOR MULTIPLE TIMES AND THEN BELOW BUT WILL EVENTUALLY RESTART TRYING TO NEIGHBOR UP and GO THROUGH THE WHOLE CYCLE AGAIN:
Aug 28 16:21:21.431: OSPF: Killing nbr 10.0.38.6 on Port-channel98 due to excessive (25) retransmissions
Aug 28 16:21:21.431: OSPF: 10.0.38.6 address 192.168.98.1 on Port-channel98 is dead, state DOWN
Aug 28 16:21:21.431: %OSPF-5-ADJCHG: Process 1, Nbr 10.0.38.6 on Port-channel98 from EXSTART to DOWN, Neighbor Down: Too many retransmissions
Cisco's config:
interface Port-channel98
description TO-JUNIPER-LAYER3-SWITCH-TEST
ip address 192.168.98.2 255.255.255.252
logging event spanning-tree status
logging event bundle-status
logging event trunk-status
load-interval 30
interface GigabitEthernet1/35
description TO-JUNIPER-LAYER3-SWITCH-TEST
no ip address
logging event link-status
logging event spanning-tree status
logging event bundle-status
logging event trunk-status
load-interval 30
carrier-delay msec 0
channel-group 98 mode active
router ospf 1
log-adjacency-changes
passive-interface default
no passive-interface Vlan2
no passive-interface GigabitEthernet1/35
no passive-interface Port-channel98
network 10.0.0.0 0.0.255.255 area 0
network 10.1.0.0 0.0.255.255 area 0
network 192.168.98.0 0.0.0.3 area 98
Relevant Juniper configs:
ge-0/0/46 {
ether-options {
802.3ad ae2;
ae2 {
mtu 1500;
aggregated-ether-options {
lacp {
passive;
}
}
unit 0 {
family inet {
address 192.168.98.1/30;
protocols {
ospf {
area 0.0.0.98 {
area-range 10.0.98.0/23;
interface ae2.0;
interface ge-0/0/46.0;
