From: Hai Minh (minhlth@ipmac.com.vn)
Date: Tue Sep 13 2005 - 06:56:04 GMT-3
Hi group,
I have 2 switchs: Cat2950 and Cat3550 connected via Fa0/10
On my cat2950, i configure port fa0/10 to mode dynamic auto and the other end
with dynamic desirable. The trunking works fine but when i look at dtp
information, i see something strange:
DTP information for FastEthernet0/10:
TOS/TAS/TNS: TRUNK/DESIRABLE/TRUNK
<---trunking is on
TOT/TAT/TNT: 802.1Q/802.1Q/802.1Q
<---encap dot1q
But int the statistics:
2204 native, 2204 software encap isl, 0 isl hardware native <-----what does
this mean: 2204 packets encap isl ? ---->
we all know that cat2950 does not support isl, so what does this infomation
mean ?
Thanks
-------------------------------------------------
Switch3550#sh run int fa0/10
!
interface FastEthernet0/10
switchport mode dynamic desirable
end
Switch3550#sh dtp int fa0/10
DTP information for FastEthernet0/10:
TOS/TAS/TNS: TRUNK/DESIRABLE/TRUNK
<---trunking is on
TOT/TAT/TNT: 802.1Q/802.1Q/802.1Q
<---encap dot1q
Neighbor address 1: 000C85A5700A
Neighbor address 2: 000000000000
Hello timer expiration (sec/state): 9/RUNNING
Access timer expiration (sec/state): 279/RUNNING
Negotiation timer expiration (sec/state): never/STOPPED
Multidrop timer expiration (sec/state): never/STOPPED
FSM state: S6:TRUNK
# times multi & trunk 0
Enabled: yes
In STP: no
Statistics
----------
2200 packets received (3 good)
2197 packets dropped
0 nonegotiate, 0 bad version, 2197 domain mismatches,
0 bad TLVs, 0 bad TAS, 0 bad TAT, 0 bad TOT, 0 other
4408 packets output (4408 good)
2204 native, 2204 software encap isl, 0 isl hardware native <-----what
does this from: 2204 packets encap isl ? ---->
0 output errors
-----------------------------------------------------
and this is on Cat2950:
Switch2950#sh run int fa0/10
Building configuration...
Current configuration : 69 bytes
!
interface FastEthernet0/10
switchport mode dynamic auto
end
Switch2950#sh dtp int fa0/10
DTP information for FastEthernet0/10:
TOS/TAS/TNS: TRUNK/AUTO/TRUNK
TOT/TAT/TNT: 802.1Q/802.1Q/802.1Q
Neighbor address 1: 000DBCA8838A
Neighbor address 2: 000000000000
Hello timer expiration (sec/state): 25/RUNNING
Access timer expiration (sec/state): 294/RUNNING
Negotiation timer expiration (sec/state): never/STOPPED
Multidrop timer expiration (sec/state): never/STOPPED
FSM state: S6:TRUNK
# times multi & trunk 0
Enabled: yes
In STP: no
Statistics
----------
2212 packets received (12 good)
2200 packets dropped
0 nonegotiate, 0 bad version, 2200 domain mismatches,
0 bad TLVs, 0 bad TAS, 0 bad TAT, 0 bad TOT, 0 other
4408 packets output (4408 good)
2208 native, 2200 software encap isl, 0 isl hardware native
0 output errors
0 trunk timeouts
4 link ups, last link up on Mon Mar 01 1993, 04:26:15
3 link downs, last link down on Mon Mar 01 1993, 04:25:43
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