Dell PowerConnect 7048P User Manual - Page 1023
What Is VRRP Accept Mode?, What Are VRRP Route and Interface Tracking?
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Page 1023 highlights
What Is VRRP Accept Mode? The accept mode allows the switch to respond to pings (ICMP Echo Requests) sent to the VRRP virtual IP address. The VRRP specification (RFC 3768) indicates that a router may accept IP packets sent to the virtual router IP address only if the router is the address owner. In practice, this restriction makes it more difficult to troubleshoot network connectivity problems. When a host cannot communicate, it is common to ping the host's default gateway to determine whether the problem is in the first hop of the path to the destination. When the default gateway is a virtual router that does not respond to pings, this troubleshooting technique is unavailable. In the PowerConnect switch VRRP feature, you can enable Accept Mode to allow the system to respond to pings that are sent to the virtual IP address. This capability adds support for responding to pings, but does not allow the VRRP Master to accept other types of packets. The VRRP Master responds to both fragmented and un-fragmented ICMP Echo Request packets. The VRRP Master responds to Echo Requests sent to the virtual router's primary address or any of its secondary addresses. Members of the virtual router who are in backup state discard ping packets destined to VRRP addresses, just as they discard any Ethernet frame sent to a VRRP MAC address. When the VRRP master responds with an Echo Reply, the source IPv4 address is the VRRP address and source MAC address is the virtual router's MAC address. What Are VRRP Route and Interface Tracking? The VRRP Route/Interface Tracking feature extends VRRP capability to allow tracking of specific routes and interface IP states within the router that can alter the priority level of a virtual router for a VRRP group. VRRP interface tracking monitors a specific interface IP state within the router. Depending on the state of the tracked interface, the feature can alter the VRRP priority level of a virtual router for a VRRP group. NOTE: An exception to the priority level change is that if the VRRP group is the IP address owner, its priority is fixed at 255 and cannot be reduced through the tracking process. Configuring VRRP 1023
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1,190
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1,191
-
1,192
-
1,193
-
1,194
-
1,195
-
1,196
-
1,197
-
1,198
-
1,199
-
1,200
-
1,201
-
1,202
-
1,203
-
1,204
-
1,205
-
1,206
-
1,207
-
1,208
-
1,209
-
1,210
-
1,211
-
1,212
-
1,213
-
1,214
-
1,215
-
1,216
-
1,217
-
1,218
-
1,219
-
1,220
-
1,221
-
1,222
-
1,223
-
1,224
-
1,225
-
1,226
-
1,227
-
1,228
-
1,229
-
1,230
-
1,231
-
1,232
-
1,233
-
1,234