Nexthop keepalive

[msmoon]

hi

Question...?

Is CSS check nexthop keepalive with ICMP?

[firewall]--[CSS]

From above topology, If firewall deny any icmp packet, then What will be happen on CSS's keepalive status?

When Show keepalive-summary,

Is Nexthop down?

plz answer me.

[jfoerster]

Hi,

the CSS is only probing if you configuring a keepalive otherwise no keepalive check is done afaik.

The CSS will declare any service down if the CSS does not get any response to the configured queries. This causes the service to be down after the configured retries are exceeded. In your case if the FW is denying/not answering any ICMP-request and you are probing the FW with ICMP the FW is declared as being down from the CSSes point of view.

Kind Regards,

Joerg

[Gilles Dufour]

there is an automatic keepalive when you configure static routes.

To disable the keepalive, you can use the command 'ip no-implicit-service'

However, you first need to remove the static route then apply the command above and finally reconfigure the static route.

The route will disappear from the routing table if the CSS loses the arp entry for the nexthop. So, as long as the firewall respond to arp request, everything should be ok.

Gilles.