About devinliu1991

devinliu1991 · 01-18-2017

Hi, guys We have 2 Nexus 92160s running as vPC peers in our network, the topology's like below: We found that the flags in "show mac address-table" output for one server's mac address are both "+" which means "primary entry using vPC Peer-Link". W...

devinliu1991 · 01-05-2016

We have a 2900 router that contains a directory with "space" characters in it in the flash. Directory of flash0:/ ... 260 drw- 0 Dec 4 2014 22:07:00 +08:00 CME_GUI_10.5 308 -rw- 40239440 Dec 21 2015 21:28:28 +08:00 rootfs78xx.11-0-1-11.sbn 280 drw- ...

devinliu1991 · 03-09-2015

Hi, all Our company has an ISR 2901 acted as the branch gateway. And we had purchased the SEC license to authorize the use of IPsec VPN connected to our headquarters. For some reason, when we built the network, the license we used was the Evalu...

devinliu1991 · 12-23-2014

Hi,allWhen we deploy PPPoE in our network, the "ip mtu 1942" command is necessary to be typed on the outgoing virtual interface.To find the reason, I had done such a lab as shown below.(1)Topology(2)ConfigurationPPPoE was deployed between R2 and R3 w...

devinliu1991 · 10-31-2014

Hi, all We had 3 N3K-3048 arrived recently with NX-OS version uk9.6.0.2.U1.2, and we built a simple network with topology below: 3 N3K join the same HSRP group with N3K-1 in active state, N3K-2 in standby state and N3K-3 in listen. N3K-1 and...

devinliu1991 · 01-25-2017

Hi, Paul Really thanks for your help, I misunderstood the meaning of flag "+". We've checked this issue with Cisco TAC and he told us that it is a bug which doesn't have any business impact. So it doesn't need any workaround. As you said, when the s...

devinliu1991 · 01-05-2016

Thanks dgviuc, but it still doesn't work. The router just treats the space character as the end of a string. xxxx#delete flash0:/CME\ 10.5.0\ GUI ^% Invalid input detected at '^' marker.

devinliu1991 · 12-23-2014

In the GNS environment ，the MPLS mtu value won't adjust and I have got an ICMP message to notify that the payload size is greater than the outgoing link and of course the packet was dropped.But in PPPoE environment，the packet was merely dropped witho...

devinliu1991 · 12-23-2014

Hi, JodyBy “MPLS uses a 1504-byte Ethernet frame and so the payload remains 1500 bytes” you mean that when I deploy MPLS, the mtu capacity of the “mpls ip” interface will automatically change to fit the length of the payload？because there could be mo...

devinliu1991 · 12-23-2014

Yeah, I agree with M SEB, PMTUD mechanism uses ICMP to adjust the mtu size, and on the other hand, Adjust-mss works like an agent.The reason why a router would send an ICMP message back to the source is that the payload size of a packet is bigger tha...

Member Since	‎09-11-2014 12:54 AM
Date Last Visited	‎06-05-2018 02:46 AM
Posts	23
Total Helpful Votes Received	5

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The same mac address has flag "+" on both vPC peers

How to delete a directory with "space" character

ISR Evaluation License update to Permanent License

PPPoE MTU & ICMP TBP message

Question about NX-OS HSRP

Hi, Paul

Thanks dgviuc, but it still

In the GNS environment ，the

Hi, JodyBy “MPLS uses a 1504

Yeah, I agree with M SEB,