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Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) · Cisco
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Tunnel Subblocks: src-track: Tunnel100 source tracking subblock associated with GigabitEthernet0/1 Set of tunnels with source GigabitEthernet0/1, 1 members (includes iterators), on interface <OK> This output exactly matches what the Cisco document describes for Tunnel Source Tracking.
#show show running-config all | begin Tunnel100 interface Tunnel100 tunnel mode gre ip (default) tunnel ttl 255 tunnel bandwidth transmit 8000 tunnel bandwidth receive 8000 keepalive 10 3 (default) tunnel source GigaEthernet0/1 (config) tunnel destination 209.165.202.130 (config) Nota: Para implementar un tracking, es necesario usar el comando track junto con herramientas como IP SLA para monitorear rutas, estados o accesibilidad específicos.
Option A is incorrect, the Default value has not been modified "The default values are 10 seconds for the interval and 3 retries." Option B is incorrect, the physical interface MTU = 1476 + 15 = 1500 bytes Option C is also incorrect, the default tunnel mode is none. To use GRE/IP mode, you have to explicitly set the mode to "tunnel mode gre ipv4" or "tunnel mode gre ipv6". Option D is correct, the source interface Gig 0/1 status is being tracked and monitored to determine the state of the GRE tunnel.