Background
All routers and participating switches jumbo frame is enable and it works great
All Ros v7 routers participating in OSPF with BFD enable established adjacency,exchanging routes and it works as expected
Issue
Neighbor Ros V6.49.18 stuck in Ex-Start (if BFD is enable) cycle between Ex-Start and Exchange (if BFD is disable) and of course wouldn't form adjacencies to ROS v7 routers
CCR1036 ROS V6.49.18
I can't upgrade CCR 1036 to latest v7 please don't ask ![:)]( "Smile")
I can't disable jumbo frames in all equipment because they are running in production I will try to experiment on spare equipment
Does anyone has an idea on triage the issues beside reducing the MTU to 1500 across the board? has anyone has similar situation and tips or notes please, thank you!
All routers and participating switches jumbo frame is enable and it works great
All Ros v7 routers participating in OSPF with BFD enable established adjacency,exchanging routes and it works as expected
Issue
Neighbor Ros V6.49.18 stuck in Ex-Start (if BFD is enable) cycle between Ex-Start and Exchange (if BFD is disable) and of course wouldn't form adjacencies to ROS v7 routers
CCR1036 ROS V6.49.18
Code:
/routing ospf areaadd area-id=0.0.0.1 name="AREA 1"/routing ospf instanceset [ find default=yes ] disabled=no router-id=192.168.65.5/routing ospf area rangeadd area="AREA 1" range=10.5.48.0/20/routing ospf interfaceadd cost=2 interface=internal network-type=broadcast use-bfd=yesadd cost=1 disabled=no interface=internal_v2 network-type=broadcastadd interface=bridge network-type=point-to-point/routing ospf networkadd area="AREA 1" disabled=no network=10.5.48.0/20add area=backbone disabled=no network=192.168.33.0/24add area=backbone network=192.168.30.0/24[rchan@routerX] > /interface vlan print Flags: X - disabled, R - running # NAME MTU ARP VLAN-ID INTERFACE 0 R internal 10218 enabled 30 sfp-sfpplus1 1 R ;;; For LibreQoS internal_v2 10218 enabled 4002 sfp-sfpplus1 2 R v50 10218 enabled 50 sfp-sfpplus1 [rchan@routerX] > [rchan@routerX] > /routing ospf neighbor print 0 instance=default router-id=192.168.65.1 address=192.168.30.1 interface=internal priority=128 dr-address=192.168.30.2 backup-dr-address=192.168.30.1 state="ExStart" state-changes=3 ls-retransmits=0 ls-requests=0 db-summaries=0 1 instance=default router-id=192.168.65.4 address=192.168.30.2 interface=internal priority=128 dr-address=192.168.30.2 backup-dr-address=192.168.30.1 state="ExStart" state-changes=3 ls-retransmits=0 ls-requests=0 db-summaries=0 [rchan@routerX] >CCR2116 ROS V7.17.2[rchan@routerY] > /routing/ospf/neighbor/print Flags: V - virtual; D - dynamic 0 D instance=ospf-instance-1 area=backbone address=192.168.30.2 priority=128 router-id=192.168.65.4 dr=192.168.30.2 bdr=192.168.30.1 state="Full" state-changes=6 adjacency=57m22s timeout=38s 1 D instance=ospf-instance-1 area=backbone address=192.168.30.3 priority=1 router-id=192.168.65.5 dr=192.168.30.2 bdr=192.168.30.1 state="ExStart" state-changes=3 timeout=35s [rchan@routerY] > /interface/vlan/print Flags: R - RUNNINGColumns: NAME, MTU, ARP, VLAN-ID, INTERFACE# NAME MTU ARP VLAN-ID INTERFACE 0 R Internal 9566 enabled 30 sfp-sfpplus1;;; For LibreQoS1 R Internal_v2 9566 enabled 4000 sfp-sfpplus12 R Management 9566 enabled 65 sfp-sfpplus23 R Tr69 9566 enabled 48 sfp-sfpplus1[rchan@routerY] > 
I can't disable jumbo frames in all equipment because they are running in production I will try to experiment on spare equipmentDoes anyone has an idea on triage the issues beside reducing the MTU to 1500 across the board? has anyone has similar situation and tips or notes please, thank you!
Statistics: Posted by loloski — Fri Apr 18, 2025 4:54 am