[c-nsp] Stange issue on 100 Gbs interconnection Juniper - Cisco

[james list]

Hi
One think I've omit to say is that BGP is over a LACP with currently just
one interface 100 Gbs.

I see that the issue is triggered on Cisco when eth interface seems to go
in Initializing state:


2024 Feb  9 16:39:36 NEXUS1 %ETHPORT-5-IF_DOWN_PORT_CHANNEL_MEMBERS_DOWN:
Interface port-channel101 is down (No operational members)
2024 Feb  9 16:39:36 NEXUS1 %ETHPORT-5-IF_DOWN_PARENT_DOWN: Interface
port-channel101.2303 is down (Parent interface is down)
2024 Feb  9 16:39:36 NEXUS1 %BGP-5-ADJCHANGE:  bgp- [xxx] (xxx) neighbor
172.16.6.17 Down - sent:  other configuration change
2024 Feb  9 16:39:36 NEXUS1 %ETH_PORT_CHANNEL-5-FOP_CHANGED:
port-channel101: first operational port changed from Ethernet1/44 to none
2024 Feb  9 16:39:36 NEXUS1 %ETH_PORT_CHANNEL-5-PORT_DOWN: port-channel101:
Ethernet1/44 is down
2024 Feb  9 16:39:36 NEXUS1 %ETHPORT-5-IF_BANDWIDTH_CHANGE: Interface
port-channel101,bandwidth changed to 100000 Kbit
2024 Feb  9 16:39:36 NEXUS1 %ETHPORT-5-IF_DOWN_INITIALIZING: Interface
Ethernet1/44 is down (Initializing)
2024 Feb  9 16:39:36 NEXUS1 %ETHPORT-5-IF_DOWN_PORT_CHANNEL_MEMBERS_DOWN:
Interface port-channel101 is down (No operational members)
2024 Feb  9 16:39:36 NEXUS1 %ETHPORT-5-SPEED: Interface port-channel101,
operational speed changed to 100 Gbps
2024 Feb  9 16:39:36 NEXUS1 %ETHPORT-5-IF_DUPLEX: Interface
port-channel101, operational duplex mode changed to Full
2024 Feb  9 16:39:36 NEXUS1 %ETHPORT-5-IF_RX_FLOW_CONTROL: Interface
port-channel101, operational Receive Flow Control state changed to off
2024 Feb  9 16:39:36 NEXUS1 %ETHPORT-5-IF_TX_FLOW_CONTROL: Interface
port-channel101, operational Transmit Flow Control state changed to off
2024 Feb  9 16:39:39 NEXUS1 %ETH_PORT_CHANNEL-5-PORT_UP: port-channel101:
Ethernet1/44 is up
2024 Feb  9 16:39:39 NEXUS1 %ETH_PORT_CHANNEL-5-FOP_CHANGED:
port-channel101: first operational port changed from none to Ethernet1/44
2024 Feb  9 16:39:39 NEXUS1 %ETHPORT-5-IF_BANDWIDTH_CHANGE: Interface
port-channel101,bandwidth changed to 100000000 Kbit
2024 Feb  9 16:39:39 NEXUS1 %ETHPORT-5-IF_UP: Interface Ethernet1/44 is up
in Layer3
2024 Feb  9 16:39:39 NEXUS1 %ETHPORT-5-IF_UP: Interface port-channel101 is
up in Layer3
2024 Feb  9 16:39:39 NEXUS1 %ETHPORT-5-IF_UP: Interface
port-channel101.2303 is up in Layer3
2024 Feb  9 16:39:43 NEXUS1 %BGP-5-ADJCHANGE:  bgp- [xxx] (xxx) neighbor
172.16.6.17 Up

Cheers
James

Il giorno dom 11 feb 2024 alle ore 11:12 Gert Doering <gert at greenie.muc.de>
ha scritto:

> Hi,
>
> On Sun, Feb 11, 2024 at 11:08:29AM +0100, james list via cisco-nsp wrote:
> > we notice BGP flaps
>
> Any particular error message?  BGP flaps can happen due to many different
> reasons, and usually $C is fairly good at logging the reason.
>
> Any interface errors, packet errors, ping packets lost?
>
> "BGP flaps" *can* be related to lower layer issues (so: interface counters,
> error counters, extended pings) or to something unrelated, like "MaxPfx
> exceeded"...
>
> gert
> --
> "If was one thing all people took for granted, was conviction that if you
>  feed honest figures into a computer, honest figures come out. Never
> doubted
>  it myself till I met a computer with a sense of humor."
>                              Robert A. Heinlein, The Moon is a Harsh
> Mistress
>
> Gert Doering - Munich, Germany
> gert at greenie.muc.de
>