CCNP TSHOOT 6.0 - The Cisco Learning Network

CCNPv6 TSHOOT
DLS2#show vlan filter
VLAN Map BLOCK-GUEST is filtering VLANs:
30
In the above example, access map BLOCK-GUEST has been applied to VLAN 30 and is filtering traffic.
NAT-related Commands
R1#show ip nat translations
Pro Inside global Inside local Outside local Outside global
icmp 198.133.219.20:512 10.1.10.1:512 172.20.0.1:512 172.20.0.1:512
tcp 198.133.219.20:1043 10.1.10.1:1043 172.20.0.1:23 172.20.0.1:23
tcp 198.133.219.20:1046 10.1.10.1:1046 172.20.0.1:80 172.20.0.1:80
--- 198.133.219.1 10.1.50.1 --- ---
udp 198.133.219.17:123 10.1.100.1:123 192.168.2.1:123 192.168.2.1:123
udp 198.133.219.18:123 10.1.100.252:123 192.168.2.1:123 192.168.2.1:123
udp 198.133.219.16:123 10.1.100.253:123 192.168.2.1:123 192.168.2.1:123
In the above example, PC-B (inside local 10.1.10.1) has initiated a ping (ICMP port 512), a Telnet session (TCP
port 23), and a browser (HTTP) session (TCP port 80) to the external R2 Lo1 IP address 172.20.0.1. In addition,
several internal devices have initiated NTP requests (UDP port 123) to NTP server R2 (192.168.2.1). Server
SRV1 with IP address 10.1.50.1 has a NAT static mapping to public address 198.133.219.1.
NTP-related Commands
R2#show clock
*19:19:48.350 UTC Wed Dec 21 2009
R1#show ntp associations
address ref clock st when poll reach delay offset disp
~192.168.2.1 .INIT. 16 2258 256 0 0.000 0.000 15937.
* sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured
R1#show ntp associations
address ref clock st when poll reach delay offset disp
*~192.168.2.1 127.127.1.1 3 3 64 377 0.000 -0.393 3.038
* sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured
In the first example above, R1 is configured to contact the NTP server R2 at 192.168.2.1, but the reference clock
is in the INIT state, and R1 has not peered with R2. In the second example, R1 has peered with the NTP server
R2 at 192.168.2.1, and the reference clock is now R1’s internal clock (127.127.1.1).
R1#show ntp status
Clock is unsynchronized, stratum 16, no reference clock
nominal freq is 250.0000 Hz, actual freq is 250.0002 Hz, precision is 2**24
reference time is CED4F227.B352D730 (18:08:39.700 UTC Thu Dec 17 2009)
clock offset is 0.0000 msec, root delay is 0.00 msec
root dispersion is 0.02 msec, peer dispersion is 0.00 msec
loopfilter state is 'CTRL' (Normal Controlled Loop), drift is -0.000000961 s/s
system poll interval is 64, last update was 2278 sec ago.
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